Win32/UWP build

Tutorial 29: added screenshot; added tutorial to main readme #1378

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Run time

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Job	Run time
Win10 -> Pre-checks	31s
Win10 -> Win10-Win32, Debug	22m 36s
Win10 -> Win10-Win32, Release	32m 41s
Win10 -> Win10-x64, Debug	22m 28s
Win10 -> Win10-x64, Release	35m 30s
Win10 -> Win10-Dev-x64, RelWithDebInfo	18m 41s
Win10 -> Win10-Ninja-x64, Debug	9m 25s
Win10 -> MinGW-x64, Release	12m 13s
Win10 -> UWP-x64, Debug	11m 13s
Win10 -> UWP-x64, Release	14m 28s
	2h 59m 46s