Win32/UWP build

Update documentation for using SDL with ImGui (#650) #3102

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Run time

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Job	Run time
Win10 -> Pre-checks	16s
Win10 -> Win10-Win32, Debug	25m 20s
Win10 -> Win10-Win32, Release	27m 46s
Win10 -> Win10-x64, Debug	23m 48s
Win10 -> Win10-x64, Release	28m 9s
Win10 -> Win10-Dev-x64, RelWithDebInfo	15m 0s
Win10 -> Win10-Ninja-x64, Debug	10m 53s
Win10 -> MinGW-x64, Release	12m 0s
Win10 -> UWP-x64, Debug	3m 24s
Win10 -> UWP-x64, Release	4m 14s
	2h 30m 50s