Refactoring Player entity breaks all kinds of things in a new top down project

[vchelaru]

Original error report:

Renaming the Player entity to Creature and moving it into a folder. This broke collision relationships and caused crashes. This had to be fixed manually in VS and GameScreen. I had to delete stuff the Wizard made and recreate it

This should "just work"

[vchelaru]

• Renaming Player -> Character breaks the default animations.
• Moving an entity into a folder should re-generate the GameScreen if the GameScreen had collision relationships referencing the old entity type
• Test all issues above, but with platformer instead of just top down

[vchelaru]

Fixed over a course of a few commits, most recent 0024ea1