Add a new window to display all images in one frame

1. mainwindow ui has size of 800x600, displays four 400x300 images
inlcudes: origin image, edge detected image, lane marker detected image,
color detected imamge.
2. introduce inputManager class as a layer between navproCore(back-end)
and input source which may be veries.
3. remove "using namespace xxx" to avoid pollution
4. remove couple of ancient code from early age