Inital upload of the GDI+ ImageSearch stuff

Gdip_ImageSearch.ahk is actually called Gdip_FastImageSearch.ahk just to
help keeping track of my changes based on the original function.
First release of my GDI+ ImageSearch improvements

Gdip_FastImageSearch() and Gdip_ImageSearchList()
GDI+ I.S. new feature: lock haystack/needle/both

However, the new version of Gdip_FastImageSearch() seems to cause a
memory leak.