Rewrite route as a vec of names

[andrewdavidmackenzie]

parse the string into enum of different types and make many of the other functions that query things about it simply return that info

• route_type
• without_trailing_index
• is array selector

recalculate on modifications insert, extend etc etc

[andrewdavidmackenzie]

Vec<Name> Is array index considered a name?

Clarify in docs and code that a route is a sequence of names, and have functions that assemble or disassemble a route use Names instead of Strings.

Names are used for

• flows (including “root”)
• functions
• inputs
• connections

And a Route uniquely identified one of them within the flow hierarchy.

[andrewdavidmackenzie]

Make it internally a Vec<Name> (if array index is a valid name?). digit (array element selector) can only be the last segment, or can be anywhere? Anywhere I guess... implement to_string() or display() that uses join() with "/"