WIP: Update to 0.2

This branch will bring input-method and text-input support, as well as patches mentioned in !39 (merged) to the Librem5. Previous attempt went stale.

This will unblock virtboard!21 (closed) and help virtboard#3 (closed) .

Testing plan:

nitrogen board (with phosh at factor 2 scaling)

• rotation
• auto maximization
• automatic virtboard popup when switching focus around
• virtboard typing with preedit

amd64 (with phosh at scale == 1 and (ideally) two outputs (LVDS and HDM1))

• rotation via phosh's rotation toggle in the settings menu
• moving of surfaces between outputs
• auto maximazation
• phosh's xdg app switching
• brighness slider in phosh (needs g-s-d power running)
• nightlight (toggle in g-c-c)
• switching of primary output in g-c-c
• idle timer activates screen lock
• restarting phosh several times
• running phosh against the unpatched wlroots
• check rootston's power consumption using powertop (~15mW, peaks at ~70mW)
• automatic virtboard popup when switching focus around
• virtboard typing with preedit

(note that touch input won't work out of the box due to https://github.com/swaywm/wlroots/issues/940

rootston-on-X at scale factor 2

• auto maximization
• phosh app switching
• automatic virtboard popup when switching focus around
• virtboard typing with preedit

qemu (at scale == 2)

• rotation
• librem5 like geometry
• phosh app switching
• automatic virtboard popup when switching focus around
• virtboard typing with preedit

general

• make sure that stuff from !39 (merged) is still working. I used the new version of output.c wholesale under the assumption that cherry-picks can be ignored.