Initial working version. Only 8x8 tiles.

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+Simple tool to convert PNG files with a palette to 4 or 16 colour SNES
+tiles.  It currently only supports 8x8 tiles.
+
+Usage: snesgfx [-p palette_file] [-s] [-c colours] source.png dest.data
+
+-p palette_file	Write a SNES palette based on the one in the image to the
+		passed file.
+-s		Indicates 16x16 tiles.  Currently unsupported.
+-c colours	Colours -- either 4 or 16.  Defaults to 4.
+source.png	The source PNG file.
+dest.data	Where to write the SNES tile data.