Pose Shape Keys

Changelog

Improve automatic driver set-up:

• If the shape key's name has a left/right side indicator, ignore any posed bones of the opposite side
• Fix checking for 0 values was not working well at all due to precision issues
• Draw posed values in the pop-up for sanity
• Fix allowing invalid driver variable names

Hopefully this feature will be finally as useful as originally dreamed up to be, but of course there will still be cases where you'd want to manually tweak the drivers.

UI foolproofing:

• Show error icons when a shape key is missing or not specified
• Don't draw mask vertex group selector if a shape key wasn't selected yet
• Clear the vertex group/shape key input string when toggling creation of new vertex group off
• Don't allow pose keys with name consisting only of whitespace
• Don't allow creating shape key slot without a shape key name being specified (whether creating a new one or not.)
• Initialize as True and don't allow disabling of "Create Shape Key" toggle when there are no shape keys (so one must be created)

Changelog

Initial Release, with new automatic Driver set-up function and reworked UX.

Should be compatible with Blender 3.1 and beyond.