Contexts, Canvas, new apps, Input device capabilities, UniversalInput, prettier UI, tests, safer shell scripts

[CRImier]

New chunk of changes to be merged into master

Testing:

• [x] Input device capabilities and UniversalInput
  • [x] ZeroPhone
  • [x] Hardpass
  • [x] Adafruit OLED Bonnet
  • [x] Emulator
• [x] Prettier UI
  • Affected: BaseListUIElements, CharArrowKeyInput, DialogBox
  • [x] ZeroPhone
  • [x] Emulator
• [x] Safer shell scripts
  • [x] Install from scratch on a ZeroPhone
• [x] Systemctl app

Problems:

• [x] python-gi needs to be installed for systemctl app to work, need to work around it
  • [x] add it to setup.sh in some way, too?
• [x] add proper zerophone_hw version to requirements.txt
• [x] add jsonrpclib to requirements.txt
• [x] add pyotp to requirements.txt
• [x] lower default debug levels for context manager and input.input