Update to version 0.12.0

Version 0.12.0 has been released. Experimenting with a new choice menu and playing with some Ren'py features. There's also been some refactoring to the battle code to make it easier to maintain, but this shouldn't affect the game.

Added:
- Added bars in the main choice screen to display how upgraded each choice currently is

- The design and abilities of the hero in position 0 can now change depending on your choices

Changed:
- Redesigned the main choice screen

- Improved how the "Full Moon" choices affects stats

 - Minor tweaks to some scenarios and the results from them