The mcuboot imgtool uses the python module `cbor`.
An equivalent and updated package `cbor2` requires Python 3.7 or newer.
The arch packages provide a package `python-cbor2`, but no package for
`cbor`.
This patch makes it possible to use the system package by adding
support for the `cbor2` package additionally to the `cbor` package.
This new FW is build on the same codebasse than the actual InfiniTime. Only the display task is different (this allows to remove lvgl from the recovery fw, which is very heavy).
CMake builds and docker have been modified accordingly.
Note than the fw is converted into an image and then into a DFU in the cmake build (previously, it was only done in the
