Ensure schematics manager is initialised on reloads (#2896)

Author: me4502

worldedit-core/src/main/java/com/sk89q/worldedit/extension/platform/Capability.java

@@ -53,7 +53,6 @@ void uninitialize(PlatformManager platformManager, Platform platform) {
         @Override
         void initialize(PlatformManager platformManager, Platform platform) {
             WorldEdit.getInstance().getAssetLoaders().init();
-            WorldEdit.getInstance().getSchematicsManager().init();
         }
 
         @Override

worldedit-core/src/main/java/com/sk89q/worldedit/internal/SchematicsEventListener.java

@@ -19,6 +19,7 @@
 
 package com.sk89q.worldedit.internal;
 
+import com.sk89q.worldedit.WorldEdit;
 import com.sk89q.worldedit.event.platform.ConfigurationLoadEvent;
 import com.sk89q.worldedit.internal.util.LogManagerCompat;
 import com.sk89q.worldedit.util.eventbus.Subscribe;
@@ -43,5 +44,9 @@ public void onConfigLoad(ConfigurationLoadEvent event) {
         } catch (IOException e) {
             LOGGER.warn("Failed to create schematics directory", e);
         }
+
+        // Initialize the schematics manager, running uninit first in case this is a reload.
+        WorldEdit.getInstance().getSchematicsManager().uninit();
+        WorldEdit.getInstance().getSchematicsManager().init();
     }
 }