Add conflicting graph "three" with drawings
Remove the collision domain interface and add a dispatcher class instead
Fix collision java packages, add subpackage geom
Add methods for collision vis to orthogonal drawings and ipe draw
Fix NPE in collision domain and add method for line-line check
Add method for collision check without adding to collision manager
Do not try to manage empty lines in collision manager

Fixes an illegal state exception when creating lines.
Draw the smooth drawings with collision detection
Fix drawing of two graphs into one page on exceptions in rome bc task
Add interval class
Simplify box with interval methods, add intersections with other boxes
Remove unneccessary imports from tests
Add test for box intersection
Add test for box' intersects predicate
Add empty predicates and some comments to box and interval
Add line-line line-segment and segment-segment intersections with tests
Add getters to line segment
Check collisions for lines, ignore endpoint collisions obviously
Remove some duplicate code in orthogonal ipe drawing
Combine adding and collision check to one method for collision manager