Drag & replace blocks

[Jesus89]

Related to: #191

• Drag & replace Generic, Code & Input blocks (move & create)
• Add Undo/Redo for replaced blocks
• Add Drag & replace effect (opacity)
• Replace wires by name and size (for each side)
• Replace wires by position for ports with the same name and size (for each side)

Compute the ports for each side: left, right and top. If there are ports with the same name they are ordered by position, from 0 to n.

                   Top ports 0 ·· n
                   _____|__|__|_____
  Left ports 0  --|                 |--  0 Right ports
             ·  --|      BLOCK      |--  ·
             ·  --|                 |--  ·
             n    |_________________|    n

• Replace wires by size (for each side)

If there is no match replace the connections if the port's size matches ignoring the port's name.

[Obijuan]

It works like a charm.... it is amazing! The new possibilities of this feature are... so powerfull... ¡Thanks a lot Jesus!