[WIP] Climb Stairs Without Jumping

So far the shadows for the Imperial City walls are fixed, some stairs leading up to the Imperial Palace function properly, and the wooden gates on stone walls open and close.  More of those to come!  Also have fixed some crashing causing meshes.  Here's what I've got so far:

EDIT: Oops, the collision mesh wasn't moving with it the gate door.  Fixed that in addition to adding opening doors for IC interiors.

EDIT: Henceforth only fixing stairs.

https://docs.google.com/file/d/0B-Uitcc36q25QVpyY2dCcUNxQ3c/edit?usp=sharing