[FEATURE] Universal navigator menu

[george112n]

A single universal navigator would contribute to helping a user feel as if they are always on the same network. This would form part of the "BTE Network Centralised Feel" epic.

There would be a navigator GUI for the whole network which would always remain in the user's inventory regardless of the sever and would provide everything a user needs. A command /navigator would also open the navigator. A BT would be able to disable the inventory icon and a user would also be able to toggle it.

The command could be used by a BT to access the navigator from within their own custom nav.

When on a BTE server, BT Tools would be the plugin providing this navigator since BT Tools would be on every server.