Ratio of trees generated that will be branches and not leaves. Expects
a ratio in the inclusive range of 0…1. Default is ¼.
Current depth from top. The value will be 0 for the root note,
1 for the 1st level nodes, and so on.
Max child count per branch. Default is 5.
Maximum depth of trees generated. An error is thrown if
onlyBranches is true but maxDepth is 0.
If true no leaves will be generated so that all trees will always have at
least a height of 1. Default is false.
props threaded through the recursive arbitrary for Tree.