Version 0.1.1 Alpha

• Lots of optimisation for speed. It's not the fastest language in the world, but it's no longer quite so awfully slow.
• Verified various features on Windows. In particular, console colouring works properly now.
• Better error message handling
• -> END now causes any generated choices to be cleared, effectively ending the flow completely.
• Fallback ink functions can be defined for unbound externals. Useful to test a game script in play mode.