Improved Beacon horns and trihorns

[jon-harper]

There are three new Beacon mounts, courtesy Cuiviemen. These all allow the connector to remain on the Beacon. They require a Rear Inlet that's also in the unstable branch.

Rear Inlet BOM

Parts	Qty
rear_inlet_beacon.stl	1
Screw, M3-0.5 x 6mm FHCS	1
Screw, M3-0.5 x 20mm	1
Screw, M3-0.5 x 45mm	4
Heat Set Insert, M3x5x4	1
5015 Radial Fan	1

Note that the M3 x6 is a flat head cap screw.

Dual Horns BOM

Parts	Qty
beacon_bottom.stl	1
Heat Set Insert, M3x5x4	3
Low-Profile Beacon Kit	1

Trihorn BOM

Parts	Qty
beacon_bottom_trihorns.stl	1
Heat Set Insert, M3x5x4	3
Low-Profile Beacon Kit	1

Dual Horns No HSI BOM

This uses bare screws to attach the Beacon mount and may have slightly improved airflow.

Parts	Qty
beacon_bottom.stl	1
Heat Set Insert, M3x5x4	1
Low-Profile Beacon Kit	1

[jon-harper]

Docs updated yesterday.