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feat: add `FlagsEnum::isEmpty` for checking if a FlagsEnum is empty #10079

Job	Run time
Build macos-13, Qt 5.15.2 (LTO:false, crashpad:on)	8m 41s
Build Ubuntu in Docker (ubuntu-20.04, ghcr.io/chatterino/chatterino2-build-ubuntu-20.04:latest, 6...	11m 4s
Build Ubuntu in Docker (ubuntu-22.04, ghcr.io/chatterino/chatterino2-build-ubuntu-22.04:latest, 6...	11m 4s
Build windows-latest, Qt 6.7.1 (LTO:false, crashpad:on)	14m 43s
Build windows-latest, Qt 5.15.2 (LTO:false, crashpad:off)	12m 4s
create-release	0s
	57m 36s

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