Replace yellow pipe.

Source: http://forum.secretchronicles.de/topics/158#p774
Add compatibility code for yellow pipe replacement
Adjust pipe collision rectangles.

Alex can now properly walk over horizontal pipes without flying.
Add .settings files for the new pipe variants.
Fix menu level and add it to world_4
Add some missing compatibility code for green pipes
Fix windows icon resource
Desert Break In level - fixed positioning of several objects, added decorations, adjusted difficulty