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/handlers/ScrollHandler.java

@@ -35,6 +35,7 @@ import java.util.ArrayList;
 import java.util.List;
 import net.AbstractMaplePacketHandler;
 import client.inventory.manipulator.MapleInventoryManipulator;
+import constants.ServerConstants;
 import server.MapleItemInformationProvider;
 import tools.MaplePacketCreator;
 import tools.data.input.SeekableLittleEndianAccessor;
@@ -91,9 +92,10 @@ public final class ScrollHandler extends AbstractMaplePacketHandler {
             }
         }
         
-        if (ItemConstants.isCleanSlate(scroll.getItemId()) && !(toScroll.getLevel() + toScroll.getUpgradeSlots() < ii.getEquipStats(toScroll.getItemId()).get("tuc"))) { //upgrade slots can be over because of hammers
+        if (ItemConstants.isCleanSlate(scroll.getItemId()) && !ii.canUseCleanSlate(toScroll)) {
             return;
         }
+        
         Equip scrolled = (Equip) ii.scrollEquipWithId(toScroll, scroll.getItemId(), whiteScroll, 0, c.getPlayer().isGM());
         ScrollResult scrollSuccess = Equip.ScrollResult.FAIL; // fail
         if (scrolled == null) {