Class: Timer::Action

timer event, something to do and when/how often to do it

due? inspect new run tick

blocked	[RW]	is this action blocked? if so it won’t be run
in	[R]	when this action is due next (updated by tick())

period:	how often (seconds) to run the action
data:	optional data to pass to the proc
once:	optional, if true, this action will be run once then removed
func:	associate a block to be called to perform the action

create a new action

run the action by calling its proc