animation-algos are as classes in their own package, extending the same AnimationMainClass that implements an AnimationInterface. Also a time-variable has been added to the Frame-class. Both great suggestions by Sanjo in #10.
Made two cool new animation-algos :) Try out the "rotating circle" and the "top-down + childrenStartAtParentPos". It's fun with many nodes and high anim speed. The approach of nodes starting their animation at other nodes position instead of always 0, 0 looks neat, will implement that for other animations too.
The layout-algos are also in their own package now too.
 Implemented dropdown menus (#16).