Blender Git Loki

Fixed undo bugs caused by SculptVertRef refactor. I need to figure out
the right way to make assigning a pointer to a SculptVertRef to an int*
spit out a compiler error.

Added a new cavity automasking mode for sculpt colors painting.
In theory it should also work with other sculpt tools (the
automasking code is fairly general) though it doesn't seem
to do much.

Merge remote-tracking branch 'origin/master' into temp_bmesh_multires

Also redid vcol boundary tool icon, and made a little icon for sculpt
color paint.

Fixes from merge

Merge branch 'master' into temp_bmesh_multires

Commit before merge

Some multires stuff

add NULL pointer check

Added an "Exponent" slider to Color Boundary brush.

Tweaked value for smoothing in vcol boundary tool (a slight amount of
smoothing is applied to prevent normal discontiuties from perfectly
colinear triangles).

Also reverted some CLANG compiling stuff.

View3D: take clipping into account for Frame All

Clamp the min/max used for Frame All/Selected
by the clipping region if it's set.

Resolve T81050

Cleanup: move plane array intersection into a function

Also add check to ensure a point isn't occluded by it's own plane,
which could happen if a small epsilon values are passed in.

Cleanup: Rename render texture files to texture_*

Cleanup: Remove unused variable

Cleanup: remove unused includes in readfile.c and writefile.c

Fix missing include warning

Caused by rB580ff2cb937daf43699908afe1190baea8d117aa

Cleanup: fix naming and remove unnecessary code

Refactor: move Screen .blend data read to blenkernel

Ref T76372.

Refactor: move Ipo .blend I/O to IDTypeInfo callbacks

Refactor: move Object .blend I/O to IDTypeInfo callbacks