Added to config some options to avoid inventory clear. It is a "special" version for a customer, not so necessary to update.

Fix: mobs clearing every arena reset (and improved logic).
Fix: debug message.

Feature: improvements at spectator mode.

Fixed an issue related to players drop inventory while dead.

Added a new placeholder (item time left) and a force-start command.

Fixed scoreboard formatting issues
Fixed messages.yml format in some messages

Kick fix for color parsing at signs.