Add Initial PMTiles support #35

Job	Run time
pre-job	5m 40s
windows-build-and-test (opengl, legacy)	1h 21m 58s
windows-build-and-test (opengl, drawable)	1h 22m 35s
windows-build-and-test (egl, legacy)	1h 22m 31s
windows-build-and-test (egl, drawable)	1h 22m 12s
windows-build-and-test (vulkan, drawable)	1h 22m 36s
windows-build-and-test (osmesa, legacy)	1h 22m 38s
windows-build-and-test (osmesa, drawable)	1h 22m 39s
Windows CI Result	4s
	9h 42m 53s

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