Seperate backend from frontend, abstract printer implementation

[suchmememanyskill]

( ͡° ͜ʖ ͡°)

Roadmap:

• Split settings between types of printer
• Octoprint implementation
  • Needs testing
• Serial Klipper implementation
  • Status updating
  • Sending commands
  • Resiliency
  • Gcode Images
  • Wifi-less setup
  • Make pc serial script consume less resources (don't while(true))
  • Serial script setup should use venv
• Bambu (Local) implementation
  • Status updating
    • Update fan status
  • Sending commands
  • Starting a print
  • Resiliency
  • Other printers than A1
  • Editing parameters (Fan speed, printer speed)

Misc goals:

• Custom icons
• Multi printer seems very broken (fetch_min seemingly grabbing wrong indexes of printers)
• Move Invert Screen to device section
• Don't hardcode printer data interface, think of something better (we're currently reusing the same struct across all implementations without knowing which one does what)
• Remove settings that are not available for a specific platform