Fixes input bugs.

- Changes ROM check screen to reference LEX button instead of 'action'.
- Disables green 'A' button for starting games & skipping ROM check.
- Fixes LEX button for launching games.
Chills bourbon sprite
Fixes some jump issues (horse jumping short, feet clipping on the way down)
Merge pull request #14 from mildmojo/input_fixes

Fix input bugs