Replace 12v aux power with 5v
This change is for two reasons:
- The 7805 regulator is wasteful, especially when the IIgs only has 2.5a on the 12v rail
- Some models of Apple IIe don't have a fan connector, and most II/II+'s don't
The fix for this will be to get 5v directly from the Game IO (Paddle) Port, a direct tap on the 5V power supply wire, or from a card slot.
This 5v will be used directly via an IC that performs reverse current and over-current protection.
The current design has been retroactively branded "BlueGS / BP" to distinguish it from the upcoming RP2040-based "BlueGS / RP"
Move External LED connector closer to edge to clear cable plugged in to J1.
Change footprint of D3/D4 to "Diode_SMD:D_SOD-123".
Increase width of 12V and 5V traces.
Move SD Card 3.3v trace to bottom.
Slightly move screw terminal offset to avoid clipped silkscreen warning.