Vega Strike Code

Merging audio branch into trunk
+ some trivial fixes (warnings mostly)

Included (what the audio branch had):
+ Streaming video support (with audio)
+ Functional SUCSS sound system (milestone 2 - only used for movies)
+ Aspect ratio configuration fixes (will come with a further commit)
+ Aspect ratio improvements on GUI.py (again, with a further commit)
+ Minor fixes/improvements to mesh_tool
+ Minor fixes in cmake build files

Add missing #include

Streaming sound halting problem SOLVED.

Too bad it's not THE halting problem ;-)

Basically, since the OpenAL's renderer confuses a buffer underrun with an end-of-stream condition,
I reworked the OpenAL renderer to keep manual track of the desired playing state of a renderable source.
Which is great: a renderer-specific bug fixed with (mostly) renderer-specific code.

Only change to the scene manager: it performs an idle update of the renderable prior to deactivating
it. Functions as a hook for the renderer to do internal checks, and, perhaps (as in this case), reactivate
the renderable source.

Some tricky signedness warning fixes

After playing around with widescreen, bases don't really look all that right with the vertical bars that keep their art's aspect ratio.
I very much prefer it when they fill the screen, even if they're stretched a bit.

Plus, if they fill the screen, movies look wonderful. Just wonderful.
So... I'm temporarily disabling aspect ratio fixups until we can make it configurable (it's a user preference after all).
Will ticketize that task.

GUIInit now can be invoked without screen dimensions.
It will fetch them from the config file.
It makes movies adapt better to the various screen aspect ratios.

Ticket #57: undo (or re-do) some warning-squashing that was done either wrong or bogus-like.

Note to future commits: a warning is preferable to a bogus fix. Always. Don't silence warnings for the sake of it, ever.

Another typo fixed in units.csv: fighter_barracks__rlaan.bfxm -> rlaan_fighter_barracks.bfxm

Mostly fixed soundless video playback:
* Streaming videos are now set to nonlooping by default (it's the most common usage)
* AnimatedTexture::Done() wasn't working right with streaming videos - fixed by tapping into EndOfStreamException
* Wihtout a sound source, videos have to be Reset() to make them start from... ehem... the beginning.
* Certain callbacks from certain places (Terminate() from inside Draw()) would crash the engine.
Fixed by deferred execution of the Terminate() command.

RelWithDebInfo was missing... ehem... debugging info.