Allow icons to be colorized on macOS to support native Dark mode color scheme.
Rendering on macOS Big Sur before PR:
Rendering on macOS Big Sur after PR:
Light mode stay visually unchanged.
Note, that this currently only affect the build from source, as the macos dmg includes an attributes to force light color scheme on macos windows (see https://github.com/bitcoin/bitcoin/pull/14593).
But once all glitches are fixed, we will be able to remove this temporary fix.
Edit: this PR is know including the removal of NSRequiresAquaSystemAppearance
on Info.plist file so that the color fix is apply to every build.