tools/pyboard.py: Add fast raw-paste mode.
tools/pyboard.py: Add fast raw-paste mode.

This commit adds support to pyboard.py for the new raw REPL paste mode.

Note that this new pyboard.py is fully backwards compatible with old
devices (it detects if the device supports the new raw REPL paste mode).

Signed-off-by: Damien George <99e6b749acbfbe2a596df99e91d24d6e1fdbee00@micropython.org>

pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython