Matrix app

[derivmug]

This PR adds the following things:

• A Matrix-App: You can log in, read/write messages (encrypted if the room supports it)
• MessagesMenu: A subclass of Menu, accepts a callback which gets called when the top most item of the list is selected
• NumpadKeyboardInput: A subclass of NumpadCharInput, supports the normal keyboard. Useful for testing apps in the emulator

[codecov[bot]]

Codecov Report

Merging #106 into devel will decrease coverage by 0.24%. The diff coverage is 13.69%.

@@            Coverage Diff             @@
##            devel     #106      +/-   ##
==========================================
- Coverage   36.15%   35.91%   -0.25%     
==========================================
  Files         174      176       +2     
  Lines       11875    12019     +144     
==========================================
+ Hits         4294     4317      +23     
- Misses       7581     7702     +121

Impacted Files	Coverage Δ
input/drivers/pygame_input.py	0% <ø> (ø)	:arrow_up:
ui/__init__.py	100% <100%> (ø)	:arrow_up:
ui/numpad_input.py	85.32% <100%> (+0.58%)	:arrow_up:
ui/menu.py	48.83% <21.42%> (-5.33%)	:arrow_down:
apps/matrix/main.py	6.45% <6.45%> (ø)
apps/matrix/client.py	6.66% <6.66%> (ø)
ui/config_manager.py	86.88% <0%> (+8.19%)	:arrow_up:

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[CRImier]

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