For the times we need to obtain the bitmap of an SVG icon, send these
through the new theme coloring callback if they are multi-color. This
removes some code duplication by adding a new function that gets an
imBuf from SVG Icon. This allows, for "About" logo, Dialog icons, and
file system icons the optional ability to use a single SVG source file
that works as both monochrome (themed by text color) or multicolor with
internal parts themed.
Pull Request: https://projects.blender.org/blender/blender/pulls/126215
99a4bc325e