Presentation Mode

Step forward/backward through a series of animation steps like this:

var presentation = [
  [ "CREATE_NODE", "Alice" ],
  [ "CREATE_NODE", "Bob" ],
  [ "OPEN_CHANNEL", "Alice", "Bob", 5, 0 ],
  [ "MOVE_BEADS", "Alice", "Bob", 2 ]
]

• [ ] creation of the network should be doable in single steps;
• [ ] It should be possible to move trough the presentation using prev/next buttons.
• [ ] Support prev/next arrow keys on the keyboard but also USB-presenter dongle.