#19 GBA code gen Access violation

[Jeff Hughes]

I'm just starting GBA dev and thought using a good map
editor essential.

I loaded the scrollDemo tsp file from the VC++ example
and tryed to gen output for the GBA using the TSD file
supplied with the latest version of TS. The DATA.ASM
file is generated but the program generates an access
violation at address 004B752E "Read of address
00000000". similar things happen with all the other
example tsp files I have found.

[Jeff Hughes]

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I know this is due to some of the tile sizes not being a mult of
8 but I do think the code should trap this and exit gracefully