Adds back the doors to the City

[Hazado]

Script files - H-uru/Plasma#1462

Adds back the doors to the city age
Library - https://www.youtube.com/watch?v=eQN9g3_GvGw
Museum - https://youtu.be/cKd7t_hcM-A

Added actual collisions to the doors
Moved the exclusion region on/off to the beginning of the responder

These changes make it so your not running into invisible barriers when the door is opening. When the door is closing you will notice invisible barrier a little bit, but without that I was able to be pushed through the wall and fall through the ground to the basement. I feel that these changes make the doors a better experience than what happens in CC.

[patmauro]

Working great on the test server so far after the sound fix! :) Looks like this, along with H-uru/Plasma#1462, should partially resolve #33.

[Hoikas]

Thanks for restoring these doors! I took the liberty of changing the museum doors to respect the value of the SDL variable islmMuseumDoorFunc. There is no corresponding variable for the library doors, so I left that one alone.