Voice of the PPL

Here are what as been fixed so far for 1.53:

- Fixed structure +=, -=, *=, /= operators on strings.
- Fixed StarField2.ppl demo to show pixel sprites properly.
- Fixed speed issue by optimizing interpreter caching.
- Fixed ProgMan.ppl syntax errors by replace Inherited() function calls to DefWndProc().
- New SetSpriteSurfaceEx() function that resizes the sprite to match the surface frame sizes.
- Fixed WaitForInput() function to terminate if program exits.
- Fixed & operator to work correctly with arrays and structures.

There are more to come… Stay tuned!