Add CLI-local commands and implement "?set prompt" and "?set events"

Restore the coloured CLI prompt functionality

Remove the -T option - it did nothing

Make callweaver -r -q be quiet

-q causes a remote callweaver to not print connect and disconnect
messages, nor does it receive event messages at all.

Note 1: -q has no effect on the built in console.

Note 2: there is currently no way to enable or disable event reporting
from within a running cli.

Make the -n option to suppress colour/highlighting actually work

Removed callweaver_cli. It does nothing but call callweaver -r.