Move the character output routine into its own pacakge

[skx]

We have a consolein package for reading from STDIN.

We should move the output writing into consoleout, and then allow switching the console output routine at runtime.

At the moment our output routine pretends to be a ADM-32 terminal:

• https://en.wikipedia.org/wiki/ADM-3A

This works with the WS.COM (wordstar) binary in our cpm-dist repository, and for most other stuff I tried. We can switch to raw/ANSI via the environmental variable SIMPLE_CHAR. Instead we should add a custom syscall to allow switching at runtime - as per:

• https://github.com/skx/cpmulator/blob/master/EXTENSIONS.md

Add a new binary, beneath samples/, named "console.com". Expected use will be something like:

• console
  • Show the selected output method
• console ansi|raw
  • Use raw output
• console adm
  • Use the ADM driver.