There should be a configuration option for skipping non-meaningful text events in-between XML tags

[dralley]

We should provide an option which would address #285 (comment) by trimming away Text events that do not have meaning to XML (e.g. whitespace between elements, or text prior to the first XML open tag which may include a BOM character)

To a first approximation this option essentially filters out things which aren't relevant to the information payload of an XML document, such as formatting. This should replace the existing BOM stripping behavior.

Related to #285 and #414