--help: Fix typo, use apostrophe instead of single quote

cheets -> sheets, ' -> ’
More help
Fix cheats.sh

There was a strange bug. I’m not sure what happened, but this fixes it.
Remove hard-coded line lengths from --help cheat

I’m cheating a little bit here (I’ll show myself out) in using the $file variable, which is used by the __run_cheat function.
Since the cheat command is simply eval’d in the context of this function, it has access to its variables.