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/server/life/MobSkill.java

@@ -105,14 +105,16 @@ public class MobSkill {
     }
 
     public void applyDelayedEffect(final MapleCharacter player, final MapleMonster monster, final boolean skill, final List<MapleCharacter> banishPlayers, int animationTime) {
-        TimerManager.getInstance().schedule(new Runnable() {
-                                                @Override
-                                                public void run() {
-                                                    if(monster.isAlive()) {
-                                                        applyEffect(player, monster, skill, banishPlayers);
-                                                    }
-                                                }
-                                            }, animationTime);
+        Runnable toRun = new Runnable() {
+                            @Override
+                            public void run() {
+                                if(monster.isAlive()) {
+                                    applyEffect(player, monster, skill, banishPlayers);
+                                }
+                            }
+                        };
+        
+        monster.getMap().getChannelServer().registerOverallAction(monster.getMap().getId(), toRun, animationTime);
     }
     
     public void applyEffect(MapleCharacter player, MapleMonster monster, boolean skill, List<MapleCharacter> banishPlayers) {