Schematics: Add Ability to Create Multiple Output Terms in One Network

[Raffzahn]

Ist:

As of now, terms are not connected ( see wavedrom/wavedrom#94 ) and can only have one output signal.

Soll:

Connected terms enable the creation of multiple output signals. For example a 2:4 binary decoder may be described as:

{ assign:
 [
  ["A"],
  ["B"],
  ["/A", ["INV", "A"]],
  ["/B", ["INV", "B"]],
  ["Q0", ["AND", "/A", "/B"]],
  ["Q1", ["AND", "/A", "B" ]],
  ["Q2", ["AND", "A",  "/B"]],
  ["Q3", ["AND", "A",  "B" ]],
  ]
}

And should result in