Refer to systems with IDs and have display names

[Miss-Inputs]

It would be better if a system was just something like mega_drive that I'll remember, and then it has a default display name of "Mega Drive" that gets shown to the user, and then they can customize it via systems.ini if they're into that sort of thing:

[mega_drive]
display_name = Genesis

Of course if the IDs are what's going to show up in the ini files, they need to be sensible enough for users to understand them.

[Miss-Inputs]

If I get into more overthinking, there could also potentially be a "subsystem display name" for systems that we treat the same, but we might want to display as different: so a Game Boy and Game Boy Color game both have platform ID = game_boy, but one is displayed as "Game Boy" but the other one is recognized as a subsystem/subplatform (damn I really gotta be consistent about whether I want the word platform or system) "gbc" which then can be displayed as "Game Boy Color" or it can be not displayed differently at all, depending on user preference…

I guess the first thing to do there would be to have a game.subplatform_id that == 'gbc' and then we figure out how to let the user choose whether they give a dang or not.