- closing application terminates StreamThread and NetworkSinkHandler gracefully

 - debugging required, crashing after few seconds in CachedStream::answerDataRequest()

 - class is passing all tests

 - tests missing

 - Using Qt Test framework
 - Tests are running successfully

 - target seems to be overwritten between setDevice and startSource
 - deeper debug necessary

To test:
 - VideoTranscoder
 - API-Access from QML

To fix:
 - call of startSource from QML in main.qml on stream button pressed

 - integration of api in qml
 - switching to qt av in progress

 - Support encoding profiles for 720p30, 1080p30, 1080p60, 1440p60

 - file selection dialog
 - abstraction layer in NetworkAPI

of checking for same address

* Multiple application instances per host supported now

 - Discovered devices popup in gui
 - Removed devices are going to be removed from gui

* Discovered devices popup in gui
* Removed devices are going to be removed from gui

* Todo: sort out devices that are already found
* Todo: remove devices that are not found any more

* can read c++ objects
* can call c++ object methods
* made commands static to use it in multiple files

* Trying out appending elements to list

* Added notification for incoming connection (fancy animation)