BIG Fonts, Token golfing+optimisations + #include for engine lib

New Features

• Added BIG font support for print_line()
• Reduced token usage, thanks to @sparr's token golf + optimizing efforts 🙏
• More code-tidying & token reduction of the core engine
• lmproved scumm8.p8's "template" game - added other char to talk to, items to pickup, etc. for quick testing/reference
• Reinstated Monkey Island "Thimbleweed Island" mini-game (when USE-ing the Computer) in game.p8

Fixes

• Fixed ability to cancel/overwrite UI commands
• Fixed "face opp dir" code and cutscene end
• Added missing luamin exclusions (for "doors")
• Fixed default action logic (e.g. open/close) when needs to "walkto" beforehand
• Fixed "use" positioning

Noteworthy/Breaking Changes

• Now using latest main picotool branch (no longer using scumm-8 fork) - as latest luamin now supports passing of "exclude" list.
  Scumm-8's picotool fork will be archived, as no longer required (+very old!)
• Now uses #include for engine lib in \src files + build merges dist output into new code "tab"
  (but can now also use #include in your own games too - esp. for multi-cart, all share same lib!)