Added two new primitives, which are to replace the primitives "Not
Visisted" and "Mark Visit" - and make meta model usage obsolete:
"From Here" - A filter which propogates changes with a propogation
distance of 1
"New Look" - A filter which forwards only indications of changes in an
appearance

Signed-off-by: Jakob Brandsborg Ehmsen <jakobehmsen.github@gmail.com>