allow dragging on connection

[Ecasept]

bugs:
prevent already placed wire from being dragged away

• for connected inputs: hide
• for connected wire outputs: click is move (don't allow connection), shift+click is create new connection
  • update pos of connections
• for connected component outputs: click is move create new
• for unconnected: click is move, shift+click is create new connection

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Combinations

• components
  • inputs
    • connected: hide
    • unconnected: create new connectable wire
  • outputs
    • connected: create new connectable wire
    • unconnected: create new connectable wire
• wires
  • inputs
    • connected: hide
    • unconnected: move connectable wire
  • outputs
    • connected:
      • connected to component: hide
      • connected to wire: move non-connectable wire (update pos)
    • unconnected: move connectable wire

hide handles from same component
hide inputs when input is dragged
multiple outputs support