Q4Max .74b Patch

This release replaces q4max 0.74a, but is still an incremental change on top of q4max 0.74. Therefore, servers and clients need all 3 pk4's from 0.74, and the new 0.74b pk4. Servers should remove the 0.74a pk4.
As expected, the last release - 0.74a - has helped with the framerate issues seen in q4max 0.74. Unfortunately, one of the performance improvements had an unexpected side effect, which caused servers to shutdown. This is the tweaked version, that fi