NIO needs a way to handle spaces in filenames

[yfarjoun]

Right now much of the processing of files goes through getAbsolutePath().toUri().toString() which breaks at the toUri() step when there's a space in the file.

Specifically you get a %20 in the filename instead of a space.

[jb-adams]

This issue looks related to #1034.

To avoid introducing URL encoding into a local filesystem path, can we first check that the path is a valid URI? If so, we can convert it via the current method toUri().toString(), if not, we treat it as a local path and only use .toString(). A single method could perform the check and output the correct string based on the input path.