Simple Emulator Frontend for Raspberry Pi

I was annoyed by how complex the Raspberry Pi emulator frontends are, and I was looking for an excuse to write my first Python program.  So, here it is, a barebone curses-based frontend for launching emulators.  But really it could also be used to launch anything, like videos, ebooks, etc. All the customization happens at the top of the code.  The extensions, directories, and launch commands will need corresponding entries