Blender Git Loki

Change a bit ideas behind new copying code, now ID-specific copying never handles usercount.

Makes things much simpler, and more consistent.

Also fix issue with new copying and bloody nodetrees, using same hack as
in original ntree copying code to detect 'root' ntrees that shall never
be put into bmain :(((((((

Merge branch 'master' into id_copy_refactor

Merge branch 'master' into id_copy_refactor

Initial work on new copying for nodetrees.

Note that those are an nightmare to handle correctly, current code is
like a plate of noodle, so... most likeley not fully working, think I'll
have to nuke localize code as well :(

Add remaining 'new copying' for obdata ID types.

Merge branch 'master' into id_copy_refactor

Add mball and lattice new copying, tweak a bit more skey handling.

Merge branch 'master' into id_copy_refactor

Add new Curve copying code.

Fix wrong assert, and issue with Key ID freeing tag after copying from mesh...

Removed trailing spaces

Usual i18n/UI messages fixes.

Please do not add useless tooltips! We have enough messages to translate
already...

Fix T51810: Add minimal example of usage of translation API for non-official addons.

Fixed bl_load_py_modules / script_load_modules unit test

It tried to assert that
addons/io_blend_utils/blender_bam-unpacked.whl/__init__.py was loaded when
the io_blend_utils module was imported. However, this happens only on
demand, and not directly when importing the add-on.

Fix (unreported) memory leak in Fluid modifier copying.

Also generally simplify/sanitize this copy code.

Fix (unreported) bad copying code in Mesh Deform modifier.

Fix (unreported) missing Image usercount increase when copying UVProject modifier.

Fix (unreported) bad copying of Ocean modifier.

Was needlessly complicated code, forgot to copy a value (foam_fade), and
was utterly leaking memory!

PyAPI: Fix warning about indent

Add Mesh and Key support to new copying code.