Filament Dust Filter (parametric)

Remodelled version of [Filament Dust Filter by sneakypoo](https://www.thingiverse.com/thing:190118). Almost identical to the original, but remodelled from scratch in Fusion 360 making it parametric so it's easy to tweak and sharing the F3D file so anyone can easily customize it.

This one (by default) has a bit tighter clearance to separate the parts (within the hinge) to make it less loose.

The only things I have tweaked in this so far (compared to the original design) are:
- `hinge_support_angle` to 55° (instead of original 40°) just to make it look a bit nicer imo (as long as your printer can handle a 55° overhang angle from the build plate). This is the slope that supports the hinge from the build plate.
- `hinge_pin_cone_clearance` to 0.15 (instead of original 0.2121). This is the gap between hinge pin cones and their socket that separates the two halves of this part. This defines the shortest distance between the parts (perpendicular to the faces) as long as the hinge pin