Blender Git Loki

Fix layout duplicating when changing/adding workspaces

Also fixes glitch with name clash handling when duplicating layout.

UV Unwrapping SLIM adding liveUnwrap with slim

Merge branch 'blender2.8' into workspaces

Fix layout being duplicated when activating already active workspace

Fix crashes when reading files saved with workspace branch

Wasn't easy to solve this and would prefer a more elegant solution,
commented in code what the issues are.

Implement rest planarity factor scaling

Initial Commit: Snap System: Store 2d arrays in cached to make the snap test.

This is a branch just fot test. Since storing 2d arrays gives more freedom for code changes and is more efficient.

There are some limitations to this code:
- Any change in view3d, or in the object_matrix, makes it necessary to update the cache (which is not done yet);
- Objects are stored in a ListBase at the time the context is created. This does not guarantee that objects added after its creation are included in the snap.
- Objects deleted after context creation can bring segfault problems.

I will test the performance benefits after.

Only ensure unique layout name within workspace

For users it doesn't make sense to have screen-layout names unique in
the entire .blend, since they are just a sub-set of workspaces for them.

Uses RNA_def_struct_name_property to override the RNA name of bScreen
and makes sure template_ID gets the name from RNA, not from ID directly.

fix for combining emission maps

the function that combines the emission maps was not considering the mesh distance maps. hence, when using subframes for liquids, the values were not set and the emitter object had an incorrect shape.

Support multi-window setups nicely

Opening new windows now never duplicates the workspace, you can now
show the same workspace in multiple windows. The layout is per window
though, so you can have the same workspace active in multiple windows,
but use a different active layout.

Opening windows behaves as follows now:
* Adapt behavior of rB7bc76f8a3c1416b
* Duplicating an area into a new window creates a new screen-layout, we agreed this is probably what users would want.
* Creating a new temporary window (e.g. UserPrefs) adds a new hidden screen-layout
* Enabling multi-view time-sequential creates a new window but doesn't duplicate screen-layout anymore

Allow changing to workspace that's open in another window

This needs more work still.

UV Unwrapping SLIM: small bugfixes and putting char array and not just pointer into toolsettings for vertexgroupname

UV Unwrapping SLIM: reordering functino definitions to remove prototypes and cleaning header files

UV Unwrapping SLIM: removing remainder of old minimize stretch

UV Unwrapping SLIM: space added after if

UV Unwrapping SLIM: minimize_stretch now only affects selected vertices. RESPECTS user defined pins!

UV Unwrapping SLIM: removing unnecessary ui parameters from minimize_stretch_operator

UV Unwrapping SLIM: renaming slim_c_interface to slim_capi and renaming contained functions

UV Unwrapping SLIM: renaming src to intern

UV Unwrapping SLIM: adding slim_matrix_transfer.h