[x] config - use HW switch 2 to decode on default console
[x] CONS - add a 'cons' command to ZLoader to switch between serial port and internal console
[x] Services - integrate the additional console into the services functions to make switching available to applications. Whichever is not the current console could become an aux channel
[x] Character set - decide on what's in and what's out and make ready to go into the flash image.
[x] Reset peripherals - if asked to run code that doesn't use ZLoader, reset CTC and SIO so they won't cause unexpected interrupts to the client software when it enables interrupts.
[x] Remove CSET conditional assembly
[x] Add command to write character set to flash page 2 (FPC command).
[x] Add debug break handler for Omega keyboard (similar to CTRL-C for the SIO. Use F5 as the break key.
CP/M BIOS changes
[x] Correctly implement the IOBYTE and use it to direct to either serial ports 1 or 2 or to the VDU/KBD
[x] Implement the currently missing BIOS calls for LST, PTP and CRT
CP/M BIOS changes