The frame rate cap is only deactivated if there's actual animations running so that leaving the game in the menu won't make the engine run at high frame rates.
Fixes#288.
In particular this means to remove the option to disable widescreen aspect ratios. The way this was handled makes no sense with the current render backend.
The aspect ratio code will have to be redone entirely to properly obey the backend's settings.
This is to cut down on boilerplate code because these encode the virtual screen size in the mode parameter, making it unnecessary to specify a virtual size separately.
