Rigify: annotate and fix warnings in basic rig components.HEADmaster

Introduce a method to annotate types and names of entries in the
`bones` container of rig components and apply it, and other type
annotations, to a number of not very complex rig classes.

- Introduce BaseRigMixin as a typed base class for mixins intended
  for use in rig classes (using BaseRig as a parent causes issues).
- Introduce TypedBoneDict that does not suppress the unknown attribute
  analysis in PyCharm, and use it in a system of subclasses to
  annotate the bones in various rigs. BaseBoneDict is necessary
  because the annotation affects all subclasses, so TypedBoneDict
  cannot inherit from BoneDict with the annotation.
- Add or adjust other type annotations of rig methods and utilities.
- Fix other warnings, e.g. undeclared attributes, excessively long
  lines, whitespace style issues and typos.

1 files changed, 4 insertions, 4 deletions

diff --git a/rigify/operators/action_layers.py b/rigify/operators/action_layers.py
index c089722a..b81ac0ef 100644
--- a/rigify/operators/action_layers.py
+++ b/rigify/operators/action_layers.py
@@ -119,21 +119,21 @@ class ActionSlot(PropertyGroup, ActionSlotBase):
     trans_min: FloatProperty(
         name="Min",
         default=-0.05,
-        description="Value that the transformation value must reach to put the action's timeline"
+        description="Value that the transformation value must reach to put the action's timeline "
                     "to the first frame. Rotations are in degrees"
     )
 
     trans_max: FloatProperty(
         name="Max",
         default=0.05,
-        description="Value that the transformation value must reach to put the action's timeline"
+        description="Value that the transformation value must reach to put the action's timeline "
                     "to the last frame. Rotations are in degrees"
     )
 
     is_corrective: BoolProperty(
         name="Corrective",
-        description="Indicate that this is a corrective action. Corrective actions will activate"
-                    "based on the activation of two other actions (using End Frame if both inputs"
+        description="Indicate that this is a corrective action. Corrective actions will activate "
+                    "based on the activation of two other actions (using End Frame if both inputs "
                     "are at their End Frame, and Start Frame if either is at Start Frame)"
     )