Update 129 - ramp tier models

- finally added different ramp tier models with a center cutout material

- added the new elevator stack limit of 11 (6 before)

- fixed some elevator stack bugs after making certain changes

- fixed a bug with exiting edit mode not properly canceling the move tool if in use

- fixed bugs with swapping between certain camera modes

- fixed a walking mode bug that involved sinking into a roof when crouching on it

- more small bug fixes

Patched in already:

- fixed roofs not being added to symmetry if overlapping another

- fixed merging files with wiring