Now transitioning between rooms

I now have the player character successfully transitioning between rooms as you wander the map - the game starts up in “Play” mode now, and you have to pick a level to get started (I’ve attached two rooms - pick room1.xml to start). WASD moves the character around, and bumping into doors transitions you through them.

Building the room transitions exposed some rough spots in my original design; it was heavily focused around there being only the one screen to manage, so getting the new rooms loading and transitioning took more work than I'd like. It works now, though!