Transition Effects

I've silently made a couple tiny tweaks throughout June and just made more fixes. Several tiles that you were able to pass through before - but you weren't supposed to - have been fixed. They're kinda silly, but I added tunnel transition effects when entering and exiting buildings (but not when moving between rooms in those buildings). Also added ACAB and BLM signs in the spaces since 1. both of those statements are true and always will be and 2. the Mews has an actual BLM sign on its door nowadays.

- Chris