Bird cage gravity feeder

Remixed [this bird feeder](https://www.thingiverse.com/thing:3237052/files).

This feeder is compatible with vertical bars.

- Added a diverter for the shells so they drop in the middle of the cage.
- Removed the roof.
- Removed unnecessary plastic for faster print
- Added a simple lock

I provide the OBJ file for easy remix

Specs :
- Total width : 85 mm
- Total height : 151 mm
- Hooks exterior width : 83 mm
- Hooks interior width : 71 mm
- Hook width : 6 mm