Implements world-specific permissions

Accounts for world specifiers where necessary
Makes the reload command work?
Stores the world as part of temporary permissions
Fixes sign break protection
Allows sign interaction with both right- and left-click
Fixes temporary permissions sometimes colliding
Cleans the main class a bit
Adds a "star" permission
Adds missing check for the use permission

src/main/resources/plugin.yml

@@ -18,6 +18,12 @@ commands:
     description: Used for all permission sign commands
     usage: /<command> <about/create/cancel/reload> - Used for all permission sign commands
 permissions:
+  permissionsigns.*:
+    description: Grants all PermissionSigns permissions
+    default: false
+    children:
+      permissionsigns.use: true
+      permissionsigns.admin: true
   permissionsigns.use:
     description: Allows players to use the permission signs
     default: true