Resource bar visibility

Used for ResourceBar.visibility; decides whether the bar is shown in the resource bar context.

Type	Purpose
saturn:always	The condition is always true.
saturn:non_full	Shown while the current resource is below its maximum.
saturn:non_zero	Shown while the current resource is not zero.
saturn:recently_changed	Keeps the bar shown for the given number of ticks after the resource changes.
saturn:resource_range	Shown while the current resource is within the given range.
saturn:and	Matches only when every sub-condition holds.
saturn:or	Matches when any sub-condition holds.
saturn:not	Inverts the match result of the sub-condition.