crude'n'dirty version of SSR plugin works

First beta version of SSR plugin is almost ready - looks ugly and there is still one bug I can't figure out (getting IQ's 501 error [not implemented] when sending second GenericSensorServiceRequest and I don't know why) but we are definitely on good way here. Right now I'm able to send Initiate request, receive it on the other end & prepare Acknowledge message, both Accept and Deny and send it back to the requestor. When the contents of request are modified, the modifications are indicated in the dialog.

I still have to figure out the proper way to set the size of the window and the way the subpanels are arranged inside. It turns out that making the GUI is not that easy... the fact that my artistic sense is missing somewhere is not helping either!