[v2] include: split out non-exported stuff from property.h
Reduce cluttering public interface with non-exported stuff, moving those things into a separate internal header.
Changes v2:
- also unexporting dixLookupProperty() and DeleteAllWindowProperties()
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net
Edited by Enrico Weigelt, metux IT consult .