Bevel: Make modal keymap instead of hardcoded.

Also added keys for toggling harden normals,
and cycling through miter types.
Still to do: add some shortcuts for affecting the
spread value for arc miters.

release/scripts/modules/bl_keymap_utils/keymap_hierarchy.py

@@ -111,6 +111,7 @@ _km_hierarchy = [
 
         ('Knife Tool Modal Map', 'EMPTY', 'WINDOW', []),
         ('Custom Normals Modal Map', 'EMPTY', 'WINDOW', []),
+        ('Bevel Modal Map', 'EMPTY', 'WINDOW', []),
         ('Paint Stroke Modal', 'EMPTY', 'WINDOW', []),
         ('Paint Curve', 'EMPTY', 'WINDOW', []),