Drashna Jaelre afd5cda4a0 Fix up process_leader to be a bit more optimized (#4662)
* Fix up process_leader to be a bit more optimized

* Process dual function keys better

* Make leader start a callable function

* Fix per key timer call location

* Add escape if already leading

* Return false for KC_LEAD

* Add documentation
2018-12-20 16:54:06 -08:00
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