Blender Git Loki

Merge branch 'master' into missing-libs

Serious rework (again) of append/link code, to make it more generic.

Making the code in WM area more generic (will be used by relocate libs feature too in future).
And multi-append/link shall no more close & re-open lib files for each and every idcode!

Also, serious cleanup of BLO_append_... API (renamed BLO_link_..., since it links and never appends!),
main real changes there are removing the bContext arg in favor of scene/v3d (a bit more verbose, but does
not requires a valid context anymore to be able to instanciate ob/groups!). And logic behind instanciating
or not has been simplified, previous code was really obscure and sometimes redondant, from quick tests
it still works as expected.

This is temp branch for until 2.76 is over, shall be merged in master asap then.

Merge branch 'master' into missing-libs

Merge branch 'master' into missing-libs

Merge branch 'master' into missing-libs

Merge branch 'master' into missing-libs

Merge branch 'master' into missing-libs

Merge branch 'master' into missing-libs

Merge branch 'master' into missing-libs

Merge branch 'master' into missing-libs

Merge branch 'master' into missing-libs

Fix rebase mess :/

Add outliner's visualization for broken libs, and also tag lib ID itself as missing.

Handling missing libs: changed idea, now adding 'real' empty data.

Just having 'NULL' data as placeholder is not really possible, too much places
to check against that.

WIP commit, still much to be done!

See T43351 for details.

Differential Revision: https://developer.blender.org/D1394

Add remaning 'init' callbacks for needed ID types.

Note all this remains a bit theoretical, some cases (ID types) are a bit delicate to handle here.7
Time and tests will say if it's OK as is.

Add some checks in BKE_xxx_init() that data is really NULLified.

Needed, since trying to (re)init data already set could lead to many issues,
and handling this is not in the scope of this function.

Note that definition of BLI_memcmp_null stuff is rather bad currently, no good idea where to place this. :|

Very first step to handle missing libs/datablocks when reading a file.

Idea is, instead of ignoring completely missing linked datablocks, to
create void placeholders for them.

That way, you can work on your file, save it, and find again your missing data once
lib becomes available again.

Plans are also to be able to locate missing libs and reload them at runtime.

To support all that, we must be able to make Blender survive those missing data
(i.e. empty datablocks) all over the place. This commit contains some early work
in that direction, but this will need much much more work!

Icons: Add new 'library_data_broken' one.