Lots of changes

Added interface with voter
(http://zandronum.com/forum/showthread.php?tid=3929) via new exit
function zr_exit.
Added "z_smode" cvar, this allows you to speedrun single player maps
online with the right config (allowing only 1 player but many spectators
in survival) by measuring your time at exit and storing it in luk. Many
changes to the code to accommodate this, as well as a lot of debug stuff
(commented out) to find issues.
Separated most of the zanrun decorate to its own file (zanrun_actors) as
it may not always be needed.