MacOS/iOS/tvOS build

Split ImGuiImplSDL class into two for the SDL2 and SDL3 backends. (#257) #1007

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Run time

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Job	Run time
MacOS -> Pre-Checks	13s
MacOS -> iOS-Debug	2m 28s
MacOS -> MacOS-Debug	5m 30s
MacOS -> tvOS-Debug	2m 13s
MacOS -> iOS-Release	4m 0s
MacOS -> MacOS-Release	7m 51s
	22m 15s