Adds Component, ComponentConnector, ComponentError, ComponentSession, ComponentXMLTracer, CoreComponent, ComponentSessionStanzaChannel, ComponentXMTracer, CoreComponent. Updates CoreClient, StrokeGUI, BasicSessionStream and SessionStream and Client, so that signal definition can be changed. Updates ComponentHandshake element, Entity. Updates OutgoingAdHocCommandSession to have feature parity with Swiften. This patch does not port Client or Session fully, which will be done in separate future patches. License: This patch is BSD-licensed, see Documentation/Licenses/BSD-simplified.txt for details. Test-Information: Test added for ComponentSession, which passes. Test for ComponentConnector cannot be ported right now and will be done in future patches, as it requires some bits of Network to be ported. Change-Id: I7138a2041fe28a2be7ac57cb47b15365f9334b24