…createNodeUri

Converts legacy paths like "/absolute/path", "~/site-relative/path" and "~" to the corresponding
AbsoluteNodePath depending on the passed base node.
The following syntax is not implemented and handled here:
 - node://
 - /<Neos.Neos:Sites>/my-site/main
 - some/relative/path
Also while legacy and previously allowed, node path traversal like ./neos/info or ../foo/../../bar is not handled.