Blender Git Loki

Keyframing Operator Code Cleanup:

Keyframing operators now use a dynamically-generated enum for their
"type" property, which determines the Keying Set to use for keyframing
instead of the obscure "index" values which were determined
internally. Internally though, these same indices are still being used
:)

Notes:
- I've kept the menu-building function and the special "menu" operator
for now, since it's better to not "pollute" the actual insert
keyframes operator with hardcoded menu-showing logic. Instead, the
menu operator does that, so that if you like, you could write another
such wrapper that works differently.
- The 'type' properties could have the PROP_HIDDEN flags removed,
though I think it's cleaner to leave these without this option for
now.