ScreenSaver: Correct typo

Should be Copyright 2013 not 20013
ScreenSaverRunner: Style fixes

Also update copyright info, add myself to authors list alphabetically.
ScreenSaver: Timeout if window won't lock. Fixes #4260.

If we fail to lock the window in the kInitialTickRate time, quit the thread.
We were deadlocking causing #4260 because you could open several
threads by moving through the screen saver list quickly all trying to lock
the same window at the same time, classic deadlock.
Screensaver: fix this tricky bit of logic