Rework build script

Instead of exomizing each version after assembling it, we assemble all versions first (to catch assembly errors early), then exomize as a batch and build floppies last.
I've also added an "elite-harmless-orig" configuration to mimic the original game's layout but using the improvements from Harmless; this helps with testing stability as the hiram variants are busted right now.

Author: Kroc

bin/.gitignore

@@ -1,9 +1,5 @@
 cc65
 mkd64
-*.prg
-*.d64
-*.g64
-*.crt
 
 # created when compiling exomizer,
 # not required in the repository