Merge pull request #43 from bibendovsky/master

Fixies for OpenAL, Visual C++ compiling, retexturing, mouse input
Add underwater sfx for SDL backend
Merge pull request #45 from bibendovsky/lpf

Add underwater sfx for SDL backend
Implement gl_hudscale for the console

After this change the HUD scaling is applied to the console and notify
messages. This was requested by many users.
Hide console scaling behin gl_consolescale

With this change it's possible to scale the HUD but not the console.
And vice versa.