Blender Git Loki

Add wmManipulatorType, extract from wmManipulator

Having the type in mixed in with instance
made it hard to expose types to RNA/Python.

This disables face-map select,
we could enable it but it looks like face maps will be made to work
differently.

Rename py API files

Will use for manipulator and manipulatorgroup.

Merge branch '28' into custom-manipulators

Sync with 2.8, various minor redundant changes

sync with 2.8

Merge branch '28' into custom-manipulators

WM: move manipulator API into its own files

Getting to be a hassle to track multiple manipulator classes
and callbacks.

WM: add box preset and expose colors

Merge branch '28' into custom-manipulators

RNA wrap other functions

Merge branch 'blender2.8' into custom-manipulators

WM: remove unused return values

Merge branch 'blender2.8' into custom-manipulators

Merge branch 'blender2.8' into custom-manipulators

PyAPI: Initial manipulator API

Only expose new/remove/clear & manipulator_draw function.

Merge branch 'blender2.8' into custom-manipulators

Merge branch 'blender2.8' into custom-manipulators

WM: functions for assigning all manipulator callbacks

- move callbacks into type struct
- rename render_3d_intersection -> draw_select
- add header for function signatures (needed for types and api headers).

Merge branch 'blender2.8' into custom-manipulators

Use term 'manipulator' for RNA instead of 'widget'

Annoying to have different names for RNA/DNA.