Feature: monitor WebIDE RDP connections

[rpl]

This pull request (related to the issue #52) introduces a new preference (and the related option in the start button menu) which enables monitoring of the WebIDE RDP connections.

If the preference is enabled a new RDPinspector window will be opened (it can be recognized by window title, which includes the WebIDE selected runtime name)

[janodvarko]

Neither transportObservers nor transportListeners are used, should we remove it?

[janodvarko]

Overall this is great progress!

My main concern is the UI/UX.

Currently if you open RDPi window with WebIDE you can't inspect RDP communication for a Toolbox. Similar problem was there already before, it isn't possible to intercept packets for the second opened Toolbox.

I think we still need a drop-down list (a combo-box) with list of all available connections (including Toolbox and WebIDE connections) displayed at the top of the RDPi window allowing the user to pick a connection to observe...

I am thinking about the following use cases:

A RDPi opened when there is no connection

1. The user opens RDPi console. There is neither Toolbox nor WebIDE open, so the console is empty since there is no connection available (the list of connections is also empty). Opening the console does not open the Toolbox automatically.
2. The user opens the Toolbox. The list of connections has automatically one entry. Since it's the first connection it's auto-selected, so the console automatically displays RDP traffic for the Toolbox.

Q: we could auto-select connection in the list according to the currently selected toolbox (can be a follow up).

B RDPi opened when there is a connection

1. The user opens the Toolbox (or more than one)
2. The user opens RDPi console. If there is just one connection it's automatically selected and the console displays RDP traffic for it. If there are more connections, the first one in the list is selected automatically.

Further comments:

• The list of connections is updated automatically as a Toolbox and/or WebIDE are opened or closed.
• If active connection is closed another one from the list (the first one?) is automatically selected.
• Connection label should clearly indicate what window is associated with it (e.g. using nice prefix "Toolbox/WebIDE" or window title just like now).
• The user should be able to explicitly open two RDPi consoles to observer two connections at the same time (but this should be probably done as a follow up)

Honza