Implement basic gimp pipe brush parasite parsing and selection modes. Currently, only the selection modes Constant, Incremental, Random and Pressure are implemented, and should work in brushes with dimension = 1. Other cases like dimension > 1 and selection modes like Tilt and Angular don't really work yet, but that wasn't requested in the wishlist item.

BUG: 106731

svn path=/trunk/koffice/; revision=461178