Saved games go straight to level and new splash screens WIP

On the anniversary of my first pull request - here's another. It's very buggy and definitely a WIP but I thought it was pretty cool so I'll show it off.

Saved games now save costume & character and straight from the load screen go to the last saved level. (fixing #1717 )

Also in the progress of implementing the green intro screen & the flying animation over the cityscape in the splash screen.

Please try both saved and new games to see everything - you'll have to do a new save to see costumes.