Compatible update for BYOND v500. [DO NOT MERGE]

Decided to see how well I could do making /tg/station BYOND v500 compatible. I'm making this pull request for when v500 is out of beta and is usable.

Current notes:

There's a bug in BYOND v500 that runtimes when you try to use external HTML or CSS files.

Two new variables/procs, called color and transform, are used in v500 meaning variables that use those names were changed.