Support for the Giga - Preliminary

No calls to _putch directly.

Minor OCD

Added RPi Pico platform (preliminary)

Minor cleanup

Prevents RunCPM from staying stuck in the HALT when debugger is active

Should build fine on arduinos now.

CPU Model 1 is the default

Bump CCP version

Added COPY, POKE and ECHO to internal CCP

Some more organization to CCP

Organizing CCP a bit

Added CPU speed control via BDOS call

Replaced printf with _puts

Implemented a (dumb) CPU throttling mechanism