* Moved 68705 devices into their own file.
* Made P3, P5 and U3 variants and made them load bootstrap ROMs.
* Implemented EPROM control (write is stubbed out with a logerror).
* Implemented differences for open drain I/O ports.
(nw) Base device with peripherals should really derive from the 6805
device directly, not the 68705 devices, as I/O ports are present on mask
devices (e.g. 6805P2). All drivers and devices that were using
M68705_NEW have been changed to M68705P5 - someone who knows the drivers
better should fix them up.
02d69ca65a