Fixed|libshell: Crash when shutting down app

If the link was open, a disconnection signal was emitted during
destruction when the application had been partially destroyed.
Fixed: Problem with QFont::exactMatch()

GuardMalloc reports a problem with QFont::exactMatch(). Perhaps it
is too early to call it (before Qt event loop entered), or there's
a bug in Qt 4.8.
Shell|GUI: Fine-tuned player position indicators

Also fixed QPainter state for players after the first one
(save/restore).