[Keymap] Add Minidox keymap by dustypomerleau (#5101)

* add dusty keymap

* change keymap folder to match my github username

* initial keymap completed in comments only

* layout without NAV completed in comments only

* disable Command to prevent interference with Space Cadet keys

* switch _ and \ in the symbol layer

* Layers complete through _NAV

* add thumb keys to _NAV

* complete _NUM

* all layouts complete; still needs `process_user_record()`

* completed first draft of keymap; still needs config.h to match

* corrected keycodes for Mac macro-volume keys

* fix Mac mute keycode

* add missing Mac keycodes for previous and next track

* placeholder for qwerty layout, not yet completed;

remove unnecessary breaks;

add todos

* eliminate Preonic branch before switching to Minidox branch:

• delete dustypomerleau Preonic keymap folder

• complete keymap.c (QWERTY layer, vanilla numbers layer)

TODO:
• add preferences to config.h
• complete the README

* edit commented keymap diagrams for clarity in dual function keys

* define initial config.h and add rules.mk for mouse key support

* fix redundant line after implementation of tap_code()

* fixed key_timer declaration, added README and rules

* formatting of keymap

* add CTPC to config

* cycle thumb keys to favor center position

* modify config.h for temporary Pro Micro compatibility

* remove superfluous call to use serial; homebrewed mod tap keys are still broken with OSL

* merge _SYS and _MEDIA on new Z_SYS key

* ALT_OP example of new MT macro complete

* initial narze-inspired MT fixes in PRU

* add (currently superfluous) custom keycode for the _SYS layer

* rudimentary `OSL` symbol macros that immediately register the mod and fail to reset the oneshot layer, but do output the proper keys—fix both of these things

* remove permissive hold to improve tapping performance

* remove calls to `clear_oneshot_layer_state()`, as they have no effect inside `process_record_user()`. Tapdance appears to be the way forward.

* final commit before tapdance code; correct layout in comments

* initial tapdance code for shifted mod taps

* add numeric and ergo NUM layers and pinky shifts for keycuts

* add TD() wrappers to tapdance codes and clean up commented layout guides

* add faux return to cur_dance to allow compilation - TODO: research what the default clause should be in cur_dance

* update commented schematics for better readability

* add backspace and delete to lockable layers, Z_SYS -> SYS_Z for consistency, fix schematic errors

* add `DOUBLE_SINGLE_TAP` to tapdance cases to allow doubling of the single tap character without waiting tapping term

* remove reduced oneshot tapping toggles

* update README

* newline tweak :)

* Update keyboards/minidox/keymaps/dustypomerleau/keymap.c

Co-Authored-By: dustypomerleau <dustypomerleau@users.noreply.github.com>

* Update keyboards/minidox/keymaps/dustypomerleau/config.h

Co-Authored-By: dustypomerleau <dustypomerleau@users.noreply.github.com>

* Update keyboards/minidox/keymaps/dustypomerleau/config.h

Co-Authored-By: dustypomerleau <dustypomerleau@users.noreply.github.com>

* Update keyboards/minidox/keymaps/dustypomerleau/config.h

Co-Authored-By: dustypomerleau <dustypomerleau@users.noreply.github.com>

* Update keyboards/minidox/keymaps/dustypomerleau/config.h

Co-Authored-By: dustypomerleau <dustypomerleau@users.noreply.github.com>

* remove `PREVENT_STUCK_MODIFIERS`, as this is default behavior

keyboards/minidox/keymaps/dustypomerleau/README.md

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+## dustypomerleau, Minidox layout
+
+The rationale behind my layout can be summarized as follows:
+
+- Symmetry is important because use-cases are hard to predict. Whenever possible, modifiers and layer keys should be available from either hand.
+- Inward rolls should be leveraged not just for alphas (Colemak DHm), but also for coding/symbols.
+- Number order—like alpha order—should be designed to favor use of the strongest fingers.
+- One-shot keys can greatly reduce the strain of typing, and should be leveraged.
+
+Some aspects of my layout are optimized for macOS (order of modifiers, manner of producing en and em dashes, coding of micro-volume adjustments, etc.), but can be easily tweaked for the OS of your choice.
+
+Shift can be a tricky modifier when used in `MT()` combinations, particularly for fast typists on split boards using serial. This can be partially mitigated with options in `config.h`, but still requires a relatively strict typing style/accuracy from the fast typist. The tendency is for faster typists to combat mod/tap mistakes by using very short intervals for `TAPPING_TERM`, but this can introduce its own set of complications. Shift is also one of the highest-yield opportunities to use `OSM()`. For these reasons, I pulled Shift onto dedicated keys in the thumbs for use during regular typing (the home row Shifts have been left in place for use during selection and keycuts). 
+
+The tapdance code that I used to create mod/tap keys inside my symbol layer allows up to 2 consecutive symbols within `TAPPING_TERM`. If you think you will need to quickly nest more than that, feel free to add more `case`s.
+
+### Special thanks
+
+- Everyone on the QMK Discord, for helping me work out the code for mod/tap keys using shifted symbols.
+- Everyone on the Colemak Discord, for their initial feedback on the layout.
+- @stevep and @DreymaR, for their work on Colemak DH(m), a truly awesome typing experience (and of course Shai Coleman, for starting it all off!).
+- @ckofy, for offering a dramatic improvement on Dvorak's original number order.
+- u/That-Canadian, for designing this awesome keyboard.
+
+### Questions or comments?
+
+- GitHub @dustypomerleau
+- Twitter @duspom
+- Discord @dusty#8897

keyboards/minidox/keymaps/dustypomerleau/config.h

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+// dustypomerleau, Minidox config
+
+#pragma once
+
+
+#define EE_HANDS
+#define IGNORE_MOD_TAP_INTERRUPT
+#define ONESHOT_TIMEOUT 1000
+#define TAPPING_TERM 200
+#define USE_SERIAL
+
+// optional configuration:
+
+// #define CONVERT_TO_PROTON_C
+// #define ONESHOT_TAP_TOGGLE 2 // not compatible with TAPPING_FORCE_HOLD
+// #define PERMISSIVE_HOLD
+// #define TAPPING_FORCE_HOLD // allows rapid mod use after tap event, but sacrifices double-tap to repeat
+
+// #define MOUSEKEY_DELAY 0 //  delay before cursor movement (high feels sluggish, low makes fine movement difficult)
+// #define MOUSEKEY_INTERVAL 20 // time between movement reports - low settings feel like high mouse speed
+// #define MOUSEKEY_MAX_SPEED 10
+// #define MOUSEKEY_TIME_TO_MAX 60
+// #define MOUSEKEY_WHEEL_DELAY 0
+// #define MOUSEKEY_WHEEL_MAX_SPEED 8
+// #define MOUSEKEY_WHEEL_TIME_TO_MAX 4
+

keyboards/minidox/keymaps/dustypomerleau/rules.mk

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+# dustypomerleau, Minidox rules
+
+MOUSEKEY_ENABLE = yes
+TAP_DANCE_ENABLE = yes