Cargo Boats

Clarify that the same destination can be added more than once

Model/texture overhaul (credits to https://modrinth.com/user/asof)

Add Icebreaker Upgrade - seamlessly navigate through frozen waterways!

• improve patchouli documentation
• buoys now work via a configurable bounding box rather than just horizontal offsets

• Add Patchouli guide
• Fix motorboat detector not dropping block