Add Initial PMTiles support #200

Job	Run time
pre-job	3m 49s
windows-build-and-test (opengl, legacy)	1h 35m 27s
windows-build-and-test (opengl, drawable)	1h 34m 38s
windows-build-and-test (egl, legacy)	1h 31m 59s
windows-build-and-test (vulkan, drawable)	1h 55m 15s
windows-build-and-test (osmesa, legacy)	1h 35m 5s
windows-build-and-test (osmesa, drawable)	1h 37m 29s
Windows CI Result	1s
	9h 53m 43s

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