Beatstream/(partial)Nostalgia support + fix compilation warnings

[CrazyRedMachine]

Additional notes :

• Beatstream works as well (it needs different cmd62 behavior compared to nostalgia, and gametype 4 would technically work fine with beatstream, but i'm still keeping it under the same gametype 5 as nostalgia because it is the same cab so it makes no sense having to reflash the firmware when switching games)
• When I say nostalgia support I mean the ioboard(service/test/coin) and card reader part of it (COM2 acio device on real cab), not the piano controller (COM1 acio device on real cab, with four "PANB" nodes.. support for it might come later)
• Using gametype 4 works to make Nostalgia boot but unfortunately the card reader doesn't work in this configuration therefore I added a new gametype 5 (cmd62 needs to behave like pop'n, not sure if "ICCC" is needed or having KFCA node first, but that's how it is on real cab so I wrote it that way...)
• I had to change the KFCA default pinout for some buttons as it was incompatible with PN5180 (pins 50-53 are the SPI pins on the arduino mega)
• I had to add the 115200 baudrate in sendAnswer() as during my tests I noticed this was the baudrate my data was attempting and the game wouldn't boot without it (confirmed on real hardware, it needs 115200 to work with encrypted data too...)
• Changes in IoBoard.cpp/h is just to fix compilation warnings (same with pn5180 files)