Introduced GraphObjectTypes which can be assigned to nodes to give them group properties for color, etc.
Fixed a bug which caused randomly assigned colors to change on filter events.

Also fixed a bug realted to wrong highlighting if the node focus changes using the display.

Fixed node filtering and design. Nodes may still change color during filter operations. This should be resolved when colors are hard-mapped to node types.

Renamed the overlays directory to components.
Typescript now compiles to es6 instead of es5 (es6 content gets translated by babel)