Substantiation 0.0.5 API documentation

subs.core

 Substantiation is an opinionated simple nested map validation framework:
* Predicates and description kept seperate.
* Validations map description sturcture follows validated input.
* Pure datastructures to describe validations.
* Composeability of validations should be trivial.
* Validation predicates scope is limited (can only access the checked value).
* High level decisions such as when to activate a group of validations should happen on upper layer.
* Non strict, only described items checked.