Game Maker Orphaned File Finder

This only works for Game Maker Studio 1 projects. If there's enough demand and/or I get bored I'll make an updated version that works for Game Maker Studio 2. Searches a Game Maker Studio 1 project for unused ("orphaned") assets . . . mostly. Notes: There may be more orphaned assets that we haven't been able to find: if scr_foo calls scr_bar and scr_bar calls scr_foo, and neither of them are calle…