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/BaseScheduler.java

@@ -0,0 +1,131 @@
+/*
+    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 constants.ServerConstants;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.locks.Lock;
+import server.TimerManager;
+import tools.Pair;
+import tools.locks.MonitoredLockType;
+import tools.locks.MonitoredReentrantLock;
+
+/**
+ *
+ * @author Ronan
+ */
+public abstract class BaseScheduler {
+    private int idleProcs = 0;
+    private List<SchedulerListener> listeners = new LinkedList<>();
+    private Map<Object, Pair<Runnable, Long>> registeredEntries = new HashMap<>();
+    
+    private ScheduledFuture<?> schedulerTask = null;
+    private Lock schedulerLock;
+    private Runnable monitorTask = new Runnable() {
+                                        @Override
+                                        public void run() {
+                                            runBaseSchedule();
+                                        }
+                                    };
+    
+    protected BaseScheduler(MonitoredLockType lockType) {
+        schedulerLock = new MonitoredReentrantLock(lockType, true);
+    }
+    
+    protected void addListener(SchedulerListener listener) {
+        listeners.add(listener);
+    }
+    
+    private void runBaseSchedule() {
+        schedulerLock.lock();
+        try {
+            if(registeredEntries.isEmpty()) {
+                idleProcs++;
+                
+                if(idleProcs >= ServerConstants.MOB_STATUS_MONITOR_LIFE) {
+                    if(schedulerTask != null) {
+                        schedulerTask.cancel(false);
+                        schedulerTask = null;
+                    }
+                }
+                
+                return;
+            }
+            idleProcs = 0;
+            
+            long timeNow = System.currentTimeMillis();
+            List<Object> toRemove = new LinkedList<>();
+            for(Entry<Object, Pair<Runnable, Long>> rmd : registeredEntries.entrySet()) {
+                Pair<Runnable, Long> r = rmd.getValue();
+                
+                if(r.getRight() < timeNow) {
+                    r.getLeft().run();  // runs the cancel action
+                    toRemove.add(rmd.getKey());
+                }
+            }
+            
+            for(Object mse : toRemove) {
+                registeredEntries.remove(mse);
+            }
+            
+            dispatchRemovedEntries(toRemove, true);
+        } finally {
+            schedulerLock.unlock();
+        }
+    }
+    
+    private void dispatchRemovedEntries(List<Object> toRemove, boolean fromUpdate) {
+        for (SchedulerListener listener : listeners.toArray(new SchedulerListener[listeners.size()])) {
+            listener.removedScheduledEntries(toRemove, fromUpdate);
+        }
+    }
+    
+    protected void registerEntry(Object key, Runnable removalAction, long duration) {
+        schedulerLock.lock();
+        try {
+            idleProcs = 0;
+            if(schedulerTask == null) {
+                schedulerTask = TimerManager.getInstance().register(monitorTask, ServerConstants.MOB_STATUS_MONITOR_PROC, ServerConstants.MOB_STATUS_MONITOR_PROC);
+            }
+            
+            registeredEntries.put(key, new Pair<>(removalAction, System.currentTimeMillis() + duration));
+        } finally {
+            schedulerLock.unlock();
+        }
+    }
+    
+    protected void interruptEntry(Object key) {
+        schedulerLock.lock();
+        try {
+            Pair<Runnable, Long> rm = registeredEntries.remove(key);
+            if(rm != null) rm.getLeft().run();
+            
+            dispatchRemovedEntries(Collections.singletonList(key), false);
+        } finally {
+            schedulerLock.unlock();
+        }
+    }
+}