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Sigil uses the Nokia QT platform. That is what the Qxt comes from. The NCX, OPF and XPGT are tabs for the corresponding files. The NCX and OPF must be available in all epubs, the XPGT is specific for ADE but can be ommited (and please do). The tabs-forms are probably just to display them correctly formatted.
Sigil will update the source for some actions to be sure the coding has correct syntax. The QDockWidget is part of the Nokia QT framework.
As for the last, I would not know.
I don't know why you want to know all these things, probably you want to read the sourcecode. These kind of questions you should really ask Valloric. Read more about Sigil on the forum and most of these questions you could have answered yourself. They are part of basic ePub knowlegde or Sigil knowlegde.
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