This is a lot cleaner than cd-ing above the repository (potentially
dangerous in CI because the state of the directory above the repository
is not guaranteed) and doing a 'git clone'. This will also allow
the submodule's commit to be pinned and not change without developer
intent.

This is needed for the flasher to be usable on the Raspberry Pi (with a
32-bit userspace).

Make GPS acquire a lock much faster(only lat and lon is required now). Also stop sending out-of-date coords

Firmware update readme

See merge request cats/mobile-transceiver-software!4

build flasher

See merge request cats/mobile-transceiver-software!3

add ci

See merge request cats/mobile-transceiver-software!2