More work on cleaning up debug trace logs. Added getDisplayName() overrides to the Ability & NextGamePhase interrupts so that there's now more contextual info in the output log. You'll now see what game phase is being added/resolved on the stack, and instead of a generic 'StackAbility' entry, it'll tell you what source it's coming from.

Also deleted a few debug output traces that were truly uninformative.

projects/mtg/include/ActionStack.h

@@ -71,6 +71,7 @@ class NextGamePhase: public Interruptible {
   bool extraDamagePhase();
   void Render();
   virtual ostream& toString(ostream& out) const;
+  virtual const string getDisplayName() const;
   NextGamePhase(int id);
 };
 
@@ -112,6 +113,7 @@ class StackAbility: public Interruptible {
   int resolve();
   void Render();
   virtual ostream& toString(ostream& out) const;
+  virtual const string getDisplayName() const;
   StackAbility(int id, MTGAbility * _ability);
 };