Beta 0.2, just in time for the new year.

(tagging a little early, will probably push either right before or right
after the start of January, in some handwavey attempt at coordination.)

Very quick, informal changelog for this release:

* Autojump is FINALLY public, in line with the L4D leaderboard requiring
  demos so we don't have to worry about cheaters any more

* `sv_cheats 1` now works in L4D2 lobbies

* The annoying nag dialog shown when loading the plugin in newer L4D2
  versions is blocked

* A bunch of cvars are unhidden (see fixes.c)