Adds a map hotspot to every bunker silo you own, so you can find and visit to them like any other placeable.

Selecting a bunker silo hotspot on the map also shows extra live info:
- Current fill level and fill type stored inside the silo.
- Compaction progress (%) while the silo is still open and being filled.
- Fermenting progress (%) once the silo has been closed.

Hotspots only appear for silos owned by your farm and disappear automatically when ownership changes or the silo is sold. Multiplayer supported.