make game resolution independent

[brettchalupa]

the game is currently rendered to a 1280x720 virtual render target that is then scaled up and down. it looks bad on high DPI and higher resolution. it was easy for getting started, especially when everything was pixel art, but the blurry text is driving me full bonkers

so the thought here is to remove the render target for pretty much everything (except maybe the level tiles) and try to scale stuff nice and place it in proper positions

might be a minor nightmare, we'll see