Made Key operators constexpr
Made Key operators constexpr

Made operators on Key and KeyModifierMask constexpr, allowing them to
be used in switch cases.

godotengine/godot,Shockblast/godot,sanikoyes/godot,Zylann/godot,josempans/godot,firefly2442/godot,Zylann/godot,godotengine/godot,josempans/godot,godotengine/godot,guilhermefelipecgs/godot,josempans/godot,sanikoyes/godot,ZuBsPaCe/godot,sanikoyes/godot,pkowal1982/godot,BastiaanOlij/godot,firefly2442/godot,Zylann/godot,Shockblast/godot,Shockblast/godot,josempans/godot,BastiaanOlij/godot,Shockblast/godot,ZuBsPaCe/godot,vkbsb/godot,vkbsb/godot,ZuBsPaCe/godot,Zylann/godot,BastiaanOlij/godot,Zylann/godot,ZuBsPaCe/godot,ZuBsPaCe/godot,akien-mga/godot,sanikoyes/godot,Shockblast/godot,akien-mga/godot,BastiaanOlij/godot,firefly2442/godot,Zylann/godot,pkowal1982/godot,pkowal1982/godot,Shockblast/godot,guilhermefelipecgs/godot,vkbsb/godot,ZuBsPaCe/godot,godotengine/godot,josempans/godot,josempans/godot,firefly2442/godot,vkbsb/godot,akien-mga/godot,akien-mga/godot,BastiaanOlij/godot,BastiaanOlij/godot,sanikoyes/godot,akien-mga/godot,vkbsb/godot,godotengine/godot,guilhermefelipecgs/godot,akien-mga/godot,sanikoyes/godot,sanikoyes/godot,godotengine/godot,sanikoyes/godot,BastiaanOlij/godot,Shockblast/godot,Shockblast/godot,vkbsb/godot,firefly2442/godot,josempans/godot,pkowal1982/godot,firefly2442/godot,pkowal1982/godot,guilhermefelipecgs/godot,Zylann/godot,pkowal1982/godot,pkowal1982/godot,firefly2442/godot,guilhermefelipecgs/godot,josempans/godot,vkbsb/godot,Zylann/godot,ZuBsPaCe/godot,godotengine/godot,BastiaanOlij/godot,firefly2442/godot,ZuBsPaCe/godot,pkowal1982/godot,godotengine/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,akien-mga/godot,guilhermefelipecgs/godot,vkbsb/godot,akien-mga/godot