Blender Git Loki

* Added back UI switch for the Cycles shading system. Only visible when the feature set is "Experimental".

Fix for logging FFmpeg messages

Fix #32461: adjusting brush strength with shift+F in image editor would show
the cursor too big when zoomed in. Only the size adjusment needs to follow the
zoom level of the editor, others are fixed size.

Fix for OSL shader install paths.

RTTI needs to be disabled in cycles for OSL.

Added library linking for cycles_kernel_osl to OSL libraries and added cycles_kernel_osl to the list of blender libs in creator.

Replaced dynamic_casts for node type checks by simple 'special type' identifiers. RTTI has to be disabled in cycles for OSL.

Fix #32468: 3d view texture paint mode did not show uv layout in image editor.

fix [#31694] Circle Selection is ignored within face selection in texture paint mode

code cleanup: split out defines in BKE_utildefines.h into BLO_blend_defs.h and ui defines in interface_intern.h

Color Management: fix compilation error when OCIO is disabled

array functions for endian switching.

add endian switch functions to replace macros SWITCH_INT/LONG/SHORT, with BLI_endian_switch_int32/int64/float/double...

style cleanup

style cleanup: also add debugging print function for derived mesh DM_debug_print_cdlayers()

uncomment data identifiers from sphinx docs (own error made r41509)

fix [#32434] Copy-Paste Tracks causes Blender to freeze/crash on second use.

Experimental fix for incorrect view edge visibility.

The problem is that the visibility of view edges in the view map may be incorrect.
The main cause of this issue is that view edges are constructed from a series of FEdges
without testing the visibility of the FEdges being concatenated. Later view edges
are split into pieces if two view edges intersect in the 2D image coordinate system.
After that the visibility of the view edges is computed by taking account of occluding
faces in the 3D scene. In many cases this procedure results in correct line visibility,
but not always (that is the problem).

A simple solution experimentally implemented here is not to chain FEdges at all.
Instead view edges are constructed from at most one FEdge now. This solution is only
applied to sharp FEdges (roughly corresponding to edges in the input mesh data; specifically,
silhouette, crease, border, edge mark, contour, external contour, and material boundary).

A better solution is to reorder the three steps of view edges construction mentioned above,
i.e., first splitting FEdges at 2D intersection, computing the visibility of the FEdges,
then concatenating them to build view edges. This solution is left for future work for now.

fix [#32423] Extrude crash

mistake in r50086 caused the crash (killing the wrong vertex)

remove vertex groups from a mesh or lattice when this there are no remaining vertex groups. This was dont in edit-mode but not object-mode.