Abstract channel schedulers + Mob animation track + More portal SFX

Implemented an improved scheduler system for channels, on where Runnables objects are "registered in" to run on a scheduled future time (effective run time will depend on the proc time of the worker acting under-the-hood).
Implemented a channel scheduler for detecting "mobs currently on animation state". This allows the server to send info to the client about whether a mob should cast a skill or not at that moment.
Improved concurrent protection on MapleMonster listeners registry.
Improved resource deallocation when destroying a monster object.
Added a server flag to allow clean slates to be used on equipments even on the "only successfully used scroll slots" case.
Fixed a critical deadlock case with MapleServerHandler.
Added the portal SFX for many scripted portals that still lacked the sound effect.

src/net/server/channel/worker/OverallScheduler.java

@@ -0,0 +1,40 @@
+/*
+    This file is part of the HeavenMS MapleStory Server
+    Copyleft 2016 - 2018 RonanLana
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation version 3 as published by
+    the Free Software Foundation. You may not use, modify or distribute
+    this program under any other version of the GNU Affero General Public
+    License.
+
+    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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+package net.server.channel.worker;
+
+import tools.locks.MonitoredLockType;
+
+/**
+ *
+ * @author Ronan
+ */
+public class OverallScheduler extends BaseScheduler {
+    public OverallScheduler() {
+        super(MonitoredLockType.CHANNEL_OVERALL);
+    }
+    
+    public void registerDelayedAction(Runnable runAction, long delay) {
+        registerEntry(runAction, runAction, delay);
+    }
+    
+    public void forceRunDelayedAction(Runnable runAction) {
+        interruptEntry(runAction);
+    }
+}