Create a way for a condition node to continue to be active after condition is met

[pvanallen]

This is needed where a value is to be monitored continuously rather than once. So after the condition node passes control along to the next node, it is still active while it waits for a the condition to be met again. Examples:

• The condition node is monitoring values coming form a distance generating a stream of values. When the values go above a threshold, the condition is met and control moves to the corresponding node. But the condition continues to monitor, and when the values have gone below the threshold, and then go above the threshold, it once again triggers the corresponding node.

• The condition node is monitoring text values coming from an AI driven camera system that is doing continuous object recognition. When the specified object (e.g. "car") first appears, control is passed to the appropriate node. Once that object value is no longer received (or, after a specified time), the condition resets and can retrigger the next node when the specified object descriptor is seen again.