No support for game-native resolution

[realnc]

Currently, the scummvm core always outputs 640x480. Stand-alone scummvm outputs whatever the game's resolution is (like 320x200, 320x240, etc.) It seems the RA core will instead pre-scale everything to 640x480, and as a result there's no way for the shaders (especially CRT and scaling shaders) to produce the best result possible.

It would be preferable for the scrummvm core to always output at the game's native resolution and have the scaling happen in retroarch, like with other cores.