Add Initial PMTiles support #25

Job	Run time
pre_job	9m 49s
windows-configure (opengl)	12s
windows-configure (egl)	11s
windows-configure (vulkan)	9s
windows-configure (osmesa)	10s
windows-build-and-test (opengl, legacy)	4m 17s
windows-build-and-test (opengl, drawable)	3m 56s
windows-build-and-test (egl, legacy)	3m 47s
windows-build-and-test (egl, drawable)	3m 54s
windows-build-and-test (vulkan, drawable)	4m 16s
windows-build-and-test (osmesa, legacy)	4m 17s
windows-build-and-test (osmesa, drawable)	3m 48s
Windows CI Result	2s
	38m 48s

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