Huge refactoring

Splits Portal into Portal and PortalHandler
Adds EconomyHelper to make messaging of economy string easier
Adds a lot of missing comments
Adds vehicle teleportation again, but it needs a lot of changes to work properly

src/main/java/net/knarcraft/stargate/event/StargateEvent.java

@@ -4,25 +4,6 @@ import net.knarcraft.stargate.Portal;
 import org.bukkit.event.Cancellable;
 import org.bukkit.event.Event;
 
-/*
- * stargate - A portal plugin for Bukkit
- * Copyright (C) 2011, 2012 Steven "Drakia" Scott <Contact@TheDgtl.net>
- * Copyright (C) 2021 Kristian Knarvik
- * <p>
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- * <p>
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Lesser General Public License for more details.
- * <p>
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
 /**
  * An abstract event describing any stargate event
  */
@@ -37,6 +18,7 @@ public abstract class StargateEvent extends Event implements Cancellable {
         this.cancelled = false;
     }
 
+
     public Portal getPortal() {
         return portal;
     }