Add full height collider pieces for wall, column, and closed door.

Get better in tune with my grid spirit. The tiles now properly align to the grid again at any grid size (hopefully).

Fix problems with grid sizes other than 1.0

Fixed a bug where every once in a while the bounds (Normalized) of a 2.0x2.0 tile can be 2.0000000001 instead

Added doors!!!

Handle an edge case where a floor could be flipped and still snap to the floor point, resulting in upside down room geometry.

Name the secret doors so the state will have a name in the state menu.

Slightly increase size of room when converting from feet to tiles to avoid issues with floats and floor(). Add notes on reducing save file sizes for finished rooms.

Added secret doors and refactored a number of items to allow for future expansion of the available tiles.

Fix a bug where rotated floor tiles would cause the walls to be placed in the wrong locations. Snap points now ensure the correct orientation of the floor tile.