xx Reyes in-world; adding more sleep time

slut was helping me with the problem where we miss the Subs and Options
buttons; it makes still no sense to us because these sleeps were 1.0 for
a long, long time and it never failed but upping them to 2.0 made the
buttons magically appear! thanks slut <3
Track and Clear listener handles of ":ping"ed avatars, rather than switching states.

Rather than switching states to clear the listeners after a ping for subs, (and therefore having to reinstate the ones we need), this change tracks the listener handles and removes them after 5 seconds.

I also believe this is cleaner for future maintainability of default/state_entry(), which many would assume only occurs on script reset.
Merge pull request #3 from ZinnIxtar/master

Track and Clear listener handles of ":ping"ed avatars, rather than switc...
manual commit fix

manual diff / bcomp
adding changes from #3 (ZinnIxtar)
reverting changes from Wendy (higher llSleep)
Merge pull request #4 from RayZopf/OpenCollar-master

Open collar master - manual commit fix
Merge pull request #2 from OpenCollar/master

manual fix /sync for #4