For efficiency, let's implement runs of deterministic Z-Automata also
on linearised unranked tree.

Based on my testing with a tree constructed from sprotall.xml [1] the
run is ~15 % faster than a run over UnrankedTree.

[1]: https://research.cs.wisc.edu/niagara/data.html

The representation '*' was shared with NodeWildcard. I believe '*'
is better for NodeWildcard so let's change Gap to '~'.
At first I wanted to use '_' but it is already occupied by
BottomOfTheStackSymbol and the underscore is probably better suited for
that.

closes #228

I believe we need to push a random number generator algorithm to CLI in
order to write random tests using aql scripts.

the rvalue reference captures Bit reference object here which is not intended
nor wise