Updated source file headers. ...

Also fixed the illegal-character-bug in the start menu.

Started implementing trading system (buying works now). ...

Also added UI for creator.lisp and other minor changes.

Started on creator.lisp, the ATL code generator, and implemented spreadsheet parsing. ...

Very proud of myself - this commit transforms a spreadsheet into code in under
40 lines of Lisp, and I wrote that in two hours, starting at midnight :D