visualize standard fbp patterns

[forresto]

Wirepattern might look like this: Other ideas visualized:

• vertical alignment of 'main' in and out
  • visual connection of main
  • async component = visual break in connection
• wirepattern options collapse down when zoomed out

[bergie]

Somewhat related also to #51

And see earlier mockups related to this in noflo/noflo#166:

• https://github.com/noflo/noflo/issues/166#issuecomment-43858397
• https://github.com/noflo/noflo/issues/166#issuecomment-43859107