- Standardized use of PClassActor::AllActorClasses for iterating over all classes of actors

instead of PClass::m_Types (now PClass::AllClasses).
- Removed ClassIndex from PClass. It was only needed by FArchive, and maps take care of the
  problem just as well.
- Moved PClass into a larger type system (which is likely to change some/lots once I try and actually use it and have a better feel for what I need from it).

SVN r2281 (scripting)

src/tarray.h

@@ -119,6 +119,22 @@ public:
 			Most = 0;
 		}
 	}
+	// Check equality of two arrays
+	bool operator==(const TArray<T> &other) const
+	{
+		if (Count != other.Count)
+		{
+			return false;
+		}
+		for (unsigned int i = 0; i < Count; ++i)
+		{
+			if (Array[i] != other.Array[i])
+			{
+				return false;
+			}
+		}
+		return true;
+	}
 	// Return a reference to an element
 	T &operator[] (size_t index) const
 	{