wcoverart - opens fullsize cover when hovering
DlgCoverArtFullSize - remove frame + move to the center of the screen
dlgtrackinfo - removing unused closeevent
DlgCoverArtFullSize - request only cached covers + init using CoverInfo
implements custom qlabel to show cover art + opens fullsize cover when hovering this label
move wcovermenu logic from dlgtrackinfo to wcoverartlabel
wcoverartlabel - only shows fullsize cover when wcovermenu is not visible
init dlgfullsize with the pixmap directly instead of doing a new request
wcoverart - stores fullsize pixmap in a new member (necessary to open the dlgfullsize)