motion-control: code dedup

use net::dial

motion-control: add joycon support

remove build tag on pointerc

it does not use sensors

sensors: joycon: use directions of joycon-r

implement sensors reading for joycon

evdev: generate code defs from c header

evdev::next_event: return status

sensors: wrap errno into errors::error

i2c: wrap errors to errors::error

fix build tag usage

evdev: wrap errors to errors::error

evdev-dump-events: show events by name

evdev: add code name getting functions

build: rename dump, use tags for sensors, add convenient targets

follow stdlib net module changes

buttonc: add key combo to signal motion-control

tools: buttonc: use getopt

motion-control: use getopt

motion-control: impl blocking and resetting via signal