Allow for more than 2 splits per node

[zkrising]

Is your feature request related to a problem? Please describe.
At the moment, a node can only be split horizontally or vertically once, with a fraction indicating how far apart the two are.

In the scenario where I split horizontally twice, I would love for it to instead split into 3 equally-sized chunks [A | B | C], rather than

[A | [B | C]

Describe alternatives you've considered
We could hack around this by twiddling with fraction values based on the tree as a whole, but it's probably easy enough to migrate into a non-binary tree structure. probably.

Additional context
I'm planning to work on this over the weekend, but making an issue for it just incase this is something you're interested in.

[Adanos020]

Closed by #145

[lvaroqui]

@Adanos020 In my understanding this PR issue is not closed by #145?

This issue wants to allow more than 2 nodes in the tree children.
The PR adds the possibility do disable split in a certain.

[Adanos020]

@lvaroqui Oh, you're right. Sorry about that!