====== Description ======
The OR node is a Boolean OR based on the classic fuzzy max function.

====== Constraints ======
  * Minimum number of child-nodes: 0
  * Maximum number of child-nodes: no limit
  * Valid input range: -1 to +1 (false to true)

====== Calculus ======
The OR node's value is calculated by choosing the value of its most true child-node.

value = max(value<sub>1</sub>, value<sub>2</sub>, ... value<sub>n</sub>)