Misc improvements

[jktjkt]

See the individual commits, and feel free to pick and choose what to take and what to skip.

• use argparser's exclusive flags
• fix movement speed struct unpacking
• auto reconnect upon BT disconnected
• add a --monitor mode which just continuously dumps info about the desk's current whereabouts

And first of all, thanks for writing this :).

[rhyst]

Merged! Good additions and fixes, thank you.