Disable spigot watchdog, we don't use it (#158)

This fixes WorldEdit

arclight-common/src/main/java/io/izzel/arclight/common/mixin/bukkit/WatchdogThreadMixin.java

@@ -0,0 +1,25 @@
+package io.izzel.arclight.common.mixin.bukkit;
+
+import org.spigotmc.WatchdogThread;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+
+@Mixin(value = WatchdogThread.class, remap = false)
+public class WatchdogThreadMixin {
+
+    /**
+     * @author IzzelAliz
+     * @reason
+     */
+    @Overwrite
+    public static void doStart(int timeoutTime, boolean restart) {
+    }
+
+    /**
+     * @author IzzelAliz
+     * @reason
+     */
+    @Overwrite
+    public static void tick() {
+    }
+}

arclight-common/src/main/resources/mixins.arclight.bukkit.json

@@ -35,6 +35,7 @@
     "JavaPluginMixin",
     "MaterialMixin",
     "PluginClassLoaderMixin",
-    "PotionEffectTypeMixin"
+    "PotionEffectTypeMixin",
+    "WatchdogThreadMixin"
   ]
 }