Edit Armature Toolbar: Added some tools for "Shrink Fatten" (Alt-S) type bone transform tools

For fun, I tried adding some more edit armature tools to the toolbar to
check how this is all working. Icons are missing currently, but it's a
nice test.

release/scripts/startup/bl_ui/space_toolsystem_toolbar.py

@@ -224,6 +224,32 @@ class _defs_edit_armature:
             ),
         )
 
+    @ToolDef.from_fn
+    def bone_envelope():
+        return dict(
+            text="Bone Envelope",
+            icon=None,
+            widget=None,
+            keymap=(
+                ("transform.transform",
+                 dict(release_confirm=True, mode='BONE_ENVELOPE'),
+                 dict(type='ACTIONMOUSE', value='PRESS')),
+            ),
+        )
+
+    @ToolDef.from_fn
+    def bone_size():
+        return dict(
+            text="Bone Size",
+            icon=None,
+            widget=None,
+            keymap=(
+                ("transform.transform",
+                 dict(release_confirm=True, mode='BONE_SIZE'),
+                 dict(type='ACTIONMOUSE', value='PRESS')),
+            ),
+        )
+
     @ToolDef.from_fn
     def extrude():
         return dict(
@@ -780,6 +806,10 @@ class VIEW3D_PT_tools_active(ToolSelectPanelHelper, Panel):
             None,
             *_tools_transform,
             _defs_edit_armature.roll,
+            (
+                _defs_edit_armature.bone_size,
+                _defs_edit_armature.bone_envelope,
+            ),
             None,
             (
                 _defs_edit_armature.extrude,