Instant action visualization + bug fixes

Added

• The checkpoint HUD turns red when Kirby is able to spit. This is useful for practicing TAS spit (for double hits and quick boss kills, among other things).
• The default checkpoints file now has manipulation for King Dedede.

Fixed

• The script no longer crashes if it is opened when a KDL ROM is not loaded.
• Fixed a bug with assuming which core is loaded in BizHawk.

Fixed broken script

Fixed bad comment for GPL notice that was causing script to not load.