Player tracking compass

Additions:

• Added a new option in the settings menu called "Track when offline". If enabled, trackers(hunters) are able to track the tracked player even if they're offline. But you can only START tracking while they are online.
• Added a notice for when you already have a compass and use "/trigger rtc.get_compass".

Changes:

• Now it shows the name of the tracked player when they're offline.
• Now it's almost impossible to drop your compass.

These changes were made to minimize the loss of saved positions on tracker-compasses.