Implement Meditate

Assets/Battle/InsightLevel.cs

@@ -0,0 +1,23 @@
+public class InsightLevel {
+
+    public delegate void InsightLevelChangedAction();
+    public event InsightLevelChangedAction OnChanged;
+    private int level;
+
+    public InsightLevel(int initialLevel) {
+        this.level = initialLevel;
+    }
+
+    public void Modify(int amount) {
+        int previousLevel = this.level;
+
+        this.level += amount;
+        if (this.level < 0) this.level = 0;
+
+        if (this.level != previousLevel && this.OnChanged != null) {
+            this.OnChanged();
+        }
+    }
+
+    public int Level {get => this.level;}
+}