[Add on] Sprite sheet maker

[Solodev]

I am looking in to adding in Tony's tile splitter in to the code base, so it can make new maps and also split in to individual tiles or individual sprite sheets.
making it mdi would be a good idea, but if i do that, then it will be a standalone app, not an add-in to the Ms code, it would be just to much to add in, IMHO.
but ok, i will see what i can do.