1. custom link
   hopefully direct line
   selectable for deletion: http://projectstorm.cloud/react-diagrams/?path=/story/advanced-techniques--smart-routing
   not middle pointing for links as it is in the default link
2. place the port on top of node and with some bigger size but lower z-index so we can take the same effect as in design.
3. annotation props on nodes
4. link should have props of colors

• improving the modules so we can avoid duplication like port component, link component etc in network components

The result should be the same look and feel as https://projects.invisionapp.com/share/THTVMORK3YD#/screens/391949796 in the UI level.

• For now we can skip the arrow on links.