NotARomException should be raised somewhere outside of emulator_command_lines

[Miss-Inputs]

"This is not a valid game or not something that can be launched" is logically independent of the emulator, and I'd have to repeat myself if any of the platforms that throw this had more than one emulator, so it doesn't belong there. Need to put something in system_info somehow… maybe related to #124 in that I'm gonna have to move a whole lot of things around.

[Miss-Inputs]

Yeah this makes even less sense when using roms_folders

This creates a situation where let's say some PS3 folder isn't bootable, so it raises NotARomException, but then that means it continues on as normal and descends into there and finds the EBOOT.BIN in there?

I'm very tired so I'll think of that tomorrow

[Miss-Inputs]

Sidestepped that problem by just not continuing even if process_file returns false, since nothing that uses ROM folders has more than one emulator anyway. Now back to thinking about this one instead