v3.2.0 Release Prep - Integrates consolidated feeder slot design and other misc changes

[lucian151]

• FDM part changes:

  • x-gantry-front
    • switched to using M3x12-self-tapping-screw for installing z-axis linear rail and z-limit-switch
  • y-gantry
    • tightened M5 hex nut pocket fit
  • nozzle-rack
    • removed top ribs to improve z-clearance
    • updated mounting bolt channels to reduce likelihood of M3x10-hex-head free-spinning during installation
  • static-camera-foot
    • added bumps mounting socket for tightening fit to bottom-camera-mount
  • mobo-top-cover
    • Added detents to boot and reset button to improve UX
  • feeder-slot-bracket
    • See below

• Feeder slot changes:

  • Consolidates the 50x individual feeder slot pieces into 4x subassemblies to reduce assembly time
  • These subassemblies are made from 2x unique 3D prints and 4x unique PCBs
  • Adds design files for new slot blade PCBs to source