0.0.2

simplify quantum event logic

Changed the event's observedness to a stored value, instead of computing it at O(_m_ + log _n_) every time, where _m_ is the number of observed events, and _n_ is the number of unobserved events in the event-tree.

Replaced hand-rolled "reduce" logic with the standard library's `reduce(into:)` wherever appropriate.

Replaced all static functions with instance functions.

Replaced "initial" with "earliest" and "final" with "latest" to clarify variable naming.

Modified test cases accordingly.

0.0.1

Entanglement is not yet implemented. All read access to a @Quantum variable currently is equivalent to an observation.