Added basic notification system

-Works with minimal calls to SendNotification(), infinite loop possible
on multiple calls
-Add to MoreExp()
--Add case for multiple notifications of same type combining value
--If notification timer > maxTime
---expRate = expNotifyValue / secondsPassed
---Display Exp/s instead of continuously growing value

Assets/Scripts/ExperienceBar.cs

@@ -60,7 +60,7 @@ public class ExperienceBar : MonoBehaviour {
     ++clicks;
     currentExp = currentExp + Increment;
     fillAmount = currentExp / currentRequirement;
-    Debug.Log("fillAmount = " + fillAmount);
+    //Debug.Log("fillAmount = " + fillAmount);
   }
 
   public void LevelUp()