Blender Git Loki

Store active layout of each workspace per window

Allows users having a different active window stored even in inactive
workspaces per window. So that when activating a workspace the layout
is activated that was active the last time the workspace was active in
this window.
This is basically a per window, per workspace storage, but it's probably
how users would expect things to work.

Also, getting file read/write to work correctly was a challenge once
again, had to use global oldnew-map for pointer lookup on file read.

And another 'also': had to change order in which IDs are freed, so that
workspaces are freed after window-manager. Needed so that we can free
assignments/relations correctly when closing windows.

Fix layout duplicating when changing/adding workspaces

Also fixes glitch with name clash handling when duplicating layout.

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.

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.

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.

Store active screen-layout per window

Fix crashes on file read

Move window level workspace data into struct managed by workspace code

Merge branch 'blender2.8' into workspaces

Merge branch 'blender2.8' into workspaces

Merge branch 'blender2.8' into workspaces

Merge branch 'blender2.8' into workspaces

Merge branch 'blender2.8' into workspaces

Merge branch 'blender2.8' into workspaces

Support render layer per workspace

We decided to keep workspace and scene render layer separate for now,
but in future they'll probably be either unified or there are going to
be ways to sync them.

Merge branch 'blender2.8' into workspaces

Conflicts:
source/blender/makesrna/intern/rna_space.c

Merge remote-tracking branch 'origin/blender2.8' into workspaces