added countertrack(counterstring) MTGAbility

what this does currently is remove a counter of the type counterstring and when the ability is destroyed it puts the counter back for us.
meant for weapons used as follows.
auto=teach(creature) countertrack(0/0,1,hand)

when the creature is equipped with this weapon it will remove a hand counter from the creature, when you remove the weapon, or the weapon is destroyed or whatever...it will put a hand counter back on the creature.

added dualwielding thisdescriptor...
auto=this(dualwielding) 2/2
auto=this(dualwielding) firststrike

enabled "restriction{" on phasebased triggers @next and @each...

i will work more on countertrack to extend it to domains if it currently isnt possible to use it in this case(haven't tested it on domains)....

projects/mtg/src/ThisDescriptor.cpp

@@ -253,6 +253,19 @@ ThisDescriptor * ThisDescriptorFactory::createThisDescriptor(string s)
         return NULL;
     }
     
+        //this creature has 2 of the same weapons in its children vector
+    found = s.find("dualwielding");
+    if (found != string::npos)
+    {
+        ThisDualWield * td = NEW ThisDualWield(criterion);
+        if (td)
+        {
+            td->comparisonMode = mode;
+            return td;
+        }
+        return NULL;
+    }
+
     //controller life
     found = s.find("opponentlife");
     if (found != string::npos)
@@ -561,6 +574,25 @@ ThisDamaged* ThisDamaged::clone() const
     return NEW ThisDamaged(*this);
 }
 
+ThisDualWield::ThisDualWield(int dualWield)
+{
+
+    comparisonCriterion = dualWield;
+}
+
+int ThisDualWield::match(MTGCardInstance * card)
+{
+int result = 0;
+if(card->isDualWielding)
+result = 1;
+    return matchValue(result);
+}
+
+ThisDualWield* ThisDualWield::clone() const 
+{
+    return NEW ThisDualWield(*this);
+}
+
 ThisToughness::ThisToughness(int toughness)
 {
     comparisonCriterion = toughness;