Clapper no longer has a title bar to show the media title during playback. Update window title so the video title is also shown on "Activities" view in addition to fullscreen top overlay.
This avoids D&D controllers clash and allows to freely customize how maximize, minimize and close buttons work (differently for e.g. web application) and where are they placed
The "clapper_src" directory name was unusual. This was done to make it work as a widget for other apps. Now that this functionality got removed it can be named simply "src" as recommended by guidelines.
