Don't hardcode fps for fake screen
Currently, when main hardware screen is powered-off, X server initializes fake screen's timer with 1 second update interval.
Streaming software like Nomachine or Vnc, as well as desktop input automation suffers from it, since it will forever be stuck on 1 fps until the display is turned back on.
This commit adds command line option -fakescreenfps that allows the user to change the default fake screen timer.
Signed-off-by: Baranin Alexander firstname.lastname@example.org