D1147 by @julien, with fixes/improvements
Duplicate bones where needed, otherwise use existing.
Keeps parent relations intact, can operate on parts of an armature.
move only the origin and not the bone. It doesn't need to use any object
matrices to add the bone, the only reason this worked before is because they
were still unit matrices due to depsgraph not running immediately on add.
This commit splits editarmature.c and poseobject.c into several files, such that
certain types of functionality are (mostly) self-contained within particular
files (instead of being mixed in with other functionality in a large file).
In particular, this was done so that:
1) Armature EditMode tools are now in the armature_*.c files only, and Pose Mode
tools in pose_*.c files only.
- In one or two cases, this hasn't been possible as the two modes rely on
much of the same shared infrastructure.
2) The "clear loc/rot/scale" operators and pose show/hide are no longer housed
in editarmature.c
3) Selection operators, Transform operators, structural (add/delete) operators,
and supporting utilities for the modes (enter/exit/roll-calculations) are not
all interleaved in an ad-hoc manner
Notes:
* I've tried to ensure that the history of the new files has been maintained by
doing
svn copy {editarmature.c/poseobject.c} {armature_*.c/pose_*.c}
Unfortunately, this means that the diffs are a bit messy.
* There should be no functional/logic changes here. Just code moving around and
cosmetic comment tweaks where needed.
* #includes have largely been untouched for now, but could be cleaned up later
* CMake changes untested, but should work in theory.
