Python API: add mathutils.Color functions to convert color spaces

Between scene linear and sRGB, XYZ, linear Rec.709 and ACES2065-1.

And add some clarifications about color spaces in the docs.

Fixes T98267

Ref T68926

Differential Revision: https://developer.blender.org/D14989

source/blender/python/mathutils/CMakeLists.txt

@@ -4,6 +4,7 @@ set(INC
   .
   ../../blenkernel
   ../../blenlib
+  ../../imbuf
   ../../bmesh
   ../../depsgraph
   ../../makesdna
@@ -42,6 +43,7 @@ set(SRC
 
 set(LIB
   bf_blenlib
+  bf_imbuf
   bf_python_ext
 
   ${PYTHON_LINKFLAGS}