Added an implementation tester to Bukkit, to determine which impl is in use. (For WE,WG,CB to use Paper/Spigot specific APIs)

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/WorldEditPlugin.java

@@ -104,6 +104,9 @@ public class WorldEditPlugin extends JavaPlugin implements TabCompleter {
         // platforms to be worried about... at the current time of writing
         WorldEdit.getInstance().getEventBus().post(new PlatformReadyEvent());
 
+        // Setup the BukkitImplementationTester.
+        BukkitImplementationTester.getImplementation();
+
         // Enable metrics
         new Metrics(this);
     }