Patch: allowing use of "reserved" palette colors for player characters

I'll probably do a slight revision. I noticed a tiny flaw: namely that the extra palette colors look bad on the load game screen when they are "gray'd out" because the file is not selected.

Also, I may change the structure of the .asm and the instructions associated with it, so it gets made into multiple files for multiple blocks of code, so it's easier to find the right code if you assemble it to patch manually.

Other than that I don't anticipate many changes. I'll be looking forward to seeing what people do with this. I'll probably do something with it myself, but there are other asm hacks I want to do first, in order to do the project I want.