Share sentakki gameplay events with other programs

[LumpBloom7]

This is primarily to enable DIY maimai machines to be able to have their own button lighting effects, but may also be beneficial for other purposes such as RGB rave parties or whatnot. (Mr. Keane's machine being a notable example of a machine with led lighting)

Sentakki could broadcast certain events, such as touch events, note judgements and so on using a standard format. Listeners can then process them and perform actions with the information given. (maybe to turn on a certain light somewhere)

I need to look up on how IPC should work, since I have never done something like that before. (maybe pipes? idk)