WindowManager: Move WindowEffects into a separate class #6230

Job	Run time
lint	14s
fedora	1m 24s
open-suse-leap	1m 44s
build-and-test (development-target)	1m 18s
build-and-test (unstable)	1m 22s
build-and-test (stable)	1m 24s
	7m 26s

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