Added new example video, beginning of qt interface
 Changes to be committed:
	modified:   MANIFEST.in
	modified:   nixtla/__init__.py
	modified:   nixtla/core/annotation/elan.py
	new file:   nixtla/core/tools/guis/__init__.py
	new file:   nixtla/core/tools/guis/qt_gui.py
	new file:   nixtla/res/SignerA.mp4
	modified:   nixtla/res/TrackingResultA.txt
	deleted:    nixtla/res/TrackingResultB.txt
	modified:   nixtla/res/config.ini
	modified:   setup.py