U4-898 Enforce whitespace consistency in config files

Added whitespace to the self-closing XML elements.
When .NET saves an XML document back to disk, whitespace is added to a self-closing element.

This means that if you are using version control - during an upgrade process - you will have several changes to various XML/config files, that aren't necessary.

Adding in the extra whitespace now will mean that developers will take the hit now, but in future .NET wont add extra whitespace in.