Blender Git Loki

Cleanup: Rearrange and name the enums and flags used in the transform code

Simple change that shows all the enums used in the transform code and helps
to better understand the role of the members of the struct TransInfo.

It also allows the IDE to show the name of the value represented by the
member instead of a number that needs to be consulted.

Differential Revision: https://developer.blender.org/D10312