Sign deletion and better spawn removal

Small quality of life update.

• Added physical block deletion of arena signs, when an arena is deleted through the delete command
• Added ability to remove all spawns from an arena from all available teams

Update may not be considered worth upgrading to, but can leverage the setup experience.

2.0.0-beta.2

This update brings the following:

• Added ability for spectators to click on players to follow them
• Removed legacy lore ID item recognition and replaced it with a PDC entry, to which a special namespaced key is assigned a at plugin start randomly generated ID (UUID)

This update is really small, but worth upgrading.

2.0.0-beta.1

The first beta release.
This Skywarz release uses an unreleased version of Bufig (a configuration library).
It is shaded into the attached Jar-File. If you want to contribute while in beta, you would have
to extract the shaded bufig.

See more here:
https://www.spigotmc.org/resources/skywarz.42739/update?update=526647