Question about SDL2 resolution setting
Hi,

First off, great work with this pico-8 player.  It works very well for many pico-8 carts with minor issues.  It's a nice alternative to the official pico-8 player.  With the SDL2 make option, the resolution is fixed in the code instead of using SDL2 to get the current display resolution.  Is there a particular reason for that?  I ask because I implemented this example (https://wiki.libsdl.org/SDL_GetCurrentDisplayMode#code_examples) to set the resolution per the current display and it seems to work fine in my limited testing.  If no particular reason, any concern if I submit a PR with that change for consideration?

Thanks,