Add default image provider #940

Job	Run time
Build and run tests	5m 51s
Verify that Carthage works	18m 6s
Build Texture as a static library	1m 14s
Build Texture as a dynamic framework	1m 56s
Build examples (examples-pt2)	6m 32s
Build examples (examples-pt3)	5m 52s
Build examples (examples-pt4)	7m 11s
Build examples (examples-pt1)	7m 27s
	54m 9s

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