Auto aspect ratio for camera

[hhyyrylainen]

I'd like to have an option on the bs::Camera to automatically set the aspect ratio based on where it is rendering. Ogre had an option to enable auto aspect ratio, but bsf doesn't seem to have it (the samples also manually set the aspect ratio). This requires extra work when the game window is resized, which I'd like for bsf to handle automatically.

[BearishSun]

Yep, sounds like a useful feature.