0.7.1

Update source to 0.9.0 while retaining SDL1 code from 0.7.0. This is because updating the window surface using SDL2 causes the display to be in a fixed resolution that cannot and will not be scaled to different screen sizes. Keeping the old SDL1 code while using the sdl12-compat wrapper allows for scaling a fixed resolution to any display making it easier to port it to handheld devices such as Anbernic, Powkiddy, TrimUI, etc..