SST Beta 0.5 (a.k.a Spectacular Scheduling Triumph)

I don't want to talk about how long this took to get out. I made the
mistake of tying the release to certain features that I simply didn't
have time to work on, and eventually just had to give up and release
what's done.

On the plus side, we did manage to sneak in some cool features:

* New sst_alias_remove and sst_alias_clear commands to get rid of
  aliases without restarting the game

* L4D1/2 instant resetting with sst_l4d_quickreset, which will jump
  directly to the start of a campaign and clear all vote cooldowns as
  required (thanks bill for helping with this one!)

* Unhidden cl_showdemooverlay for use as a quick and dirty recording
  indicator, for those who are paranoid about forgetting to record

* Backported snd_mute_losefocus to hear the game while tabbed out into
  another window (thanks bill again!)

* sst_mouse_factor to scale raw mouse input for view-snapping trickery

And, there's a few other changes and fixes:

* Autojump in Portal 1 now requires sv_cheats, per moderators' request

* The plugin should be able to load under Portal 2 again, although it
  doesn't do that much and realistically you'd use That Other Plugin
  instead :^)

* That issue with Unicode paths (first reported by Serg) is finally
  fixed. So, if for example you put your video game in a folder named
  "Игры" on a Russian install of Windows, SST should actually work now.
  Hooray for actually releasing bug fixes that have sat in Git for
  months!

Plus there's been a ton of code cleanup and there's ongoing internal
improvements to make development easier, so that IN THEORY we can make
future updates more easily. Yeah.. we'll see about that.

Thanks, and have fun!