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koth_buses a2

Buses now uses the alpha naming convention, because it is not complete enough to have a version name

Added some more closed environments to make demoman and soldier weaker, and make some non-navigable high ground a little clearer
Buses in mid are now at a slightly lower elevation because they are on roads

Added some garbage bags and a protruding roof by the buses that connect mid and courtyard, to allow anyone to get inside from mid through using the props as platforms
Better expressed the dangerous roads by the right side of the spawn areas