add a small preview player for the planned downloa

Having downloaded a video I sometimes find, when I am watching it the first time, it is NOT the video, I really wanted. A possiblity to control the video before finally downloading would help to save time and capacity (our Internet creeps along with max. 1Mb !) A small control-player within Save2pc could help to be sure you got the correct video, when you're pressing "Download"