GUI: Add empty Altimeter Control window
GUI: Add Altimeter Control action button

No action is implemented yet.
GUI: Set proper layout in Altimeter Control window
GUI: Update french translation files
GUI: Add serial port detection and selection
GUI: Add hidable progressbar and upload info label
GUI: Prevent interrupting communication with altimeter

Prevent user from closing window while data is sent or received.
GUI: Add window widgets disabling method

So user has to wait for previous interaction to finish before
requesting a new one.
GUI: Allow flight data upload