Initial PMTiles support #72

Job	Run time
pre-job	3m 54s
pre-job	3m 54s
windows-build-and-test (opengl, legacy)	1h 29m 57s
windows-build-and-test (opengl, legacy)	1h 29m 57s
windows-build-and-test (opengl, drawable)	1h 27m 18s
windows-build-and-test (opengl, drawable)	1h 27m 18s
windows-build-and-test (egl, legacy)	1h 36m 57s
windows-build-and-test (egl, legacy)	1h 36m 57s
windows-build-and-test (egl, drawable)	6h 0m 33s
windows-build-and-test (egl, drawable)	16m 35s
windows-build-and-test (vulkan, drawable)	22m 22s
windows-build-and-test (vulkan, drawable)	22m 22s
windows-build-and-test (osmesa, legacy)	1h 29m 48s
windows-build-and-test (osmesa, legacy)	1h 29m 48s
windows-build-and-test (osmesa, drawable)	1h 28m 14s
windows-build-and-test (osmesa, drawable)	1h 28m 14s
Windows CI Result	3s
Windows CI Result	1s
	22h 14m 12s

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