Implement RangedNode to keep the position of the node

[M3kH]

This is still a work in progress to understand desired direction.

Implements Options 4 of the Issue #91 by adding RangedNode to the library.

A desire state might be replace Node definition with the the one of RangedNode and align more with LSP defition:

struct Range {
  Start { Line int, Char int }
  End { Line int, Char int }
}

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Todo

• Define Schema
• Fix wrong line number in inline nodes
• Write test

[niklasfasching]

#91 (comment)

Since this seems stuck, I'm gonna close it for now. Feel free to re-open when you start looking into this again :)