LowRes NX with store

LowRes NX with a built-in store for browsing the public programs on lowresnx.inutilis.com, similar to PICO-8's splore and TIC-80's surf. It lists Games, Art, Tools and Examples, downloads a program and runs it, and shows its screenshot as a preview.

Start it with --store, or press Escape, Enter or Z with no program loaded. Up/Down move through the list, Left/Right page, Z or Enter runs a program, X or Escape goes back; Escape in a running program returns to the store.

Builds: Linux x86_64 (needs SDL2 and libcurl installed) and Windows x86_64 (DLLs included). Code: branch store.