Blender Git Loki

readfile: optimization for undo

Was using O(n^2) lookup on ID's with undo.

This caused undo to hang with 1000's of data-blocks
(especially with heavy scenes & outliner-space, which doesn't even need to be visible to cause a slow-down).

Internally this uses a ghash per id-type, which is lazy-initialized.
Each key uses the name and library since there may be name collisions between libraries.

Developer Notes:

- Adds small `BKE_main_idmap_*` API.
- Needed to change linking order for this to build.