Improvements to theme color handling, allow customizing appearance colors #8718

Job	Run time
build (arm64-android, android_arm64_v8a, OFF, android-arm64)	10m 0s
build (arm64-android, android_arm64_v8a, ON, android-arm64)	10m 25s
build (arm-neon-android, android_armv7, OFF, android-arm-neon)	9m 7s
build (arm-neon-android, android_armv7, ON, android-arm-neon)	8m 6s
build (x64-android, android_x86_64, OFF, android-x64)	9m 50s
build (x64-android, android_x86_64, ON, android-x64)	11m 30s
build (x86-android, android_x86, OFF, android-x86)	9m 44s
build (x86-android, android_x86, ON, android-x86)	8m 46s
comment (pr)	4s
deploy to play store	0s
comment (commit)	0s
	1h 17m 32s

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