* added few enum converters

- Fixed a bug that caused <text/> elements to be parsed incorrectly, leading to exceptions within the document.

- Fixed "#7845 - Arc Path Renders incorrectly" as described in the work item - W3C example now renders   correctly.
- Ensured that a divide by zero exception could not occur during rendering of stroke dash arrays.

- Fixed [workitem:7526] whitespaces \t \r \n in path and points result in exception. The   SvgUnitCollectionConverter (SvgUnitCollection.cs) class had to split on \r, \t and \n aswell as ' ' and ','.

- Added SvgMatrix, SvgShear and SvgSkew missing files from the previous check-in.

- Fixed #6324: SvgElement.PushTransforms and ViewBox - not necessarily related to ViewBox but every   element was 'resetting' the current graphics transform if the element contained it's own transform. This 
  was a very small fix for a large problem (SvgElement.PushTransforms Matrix transformMatrix = new   Matrix(); changed to Matrix transformMatrix = renderer.Transform; in order to inherit the current   transform.)
- Fixed #6344: Parsing document incorrectly parents elements when it encounters empty nodes which are   in a different namespace. Empty nodes are now ignored and current nodes are closed as required. We'll 
  see how this fix goes.
- Fixed #6381: Units in inches are incorrectly parsed as millimeters - problem was caused by some   copy/paste work.
- Graphics has been replaced by SvgRenderer. This is essentially a wrapper around graphics but will allow
  custom svg related properties in the future when needed.
- Removed ISvgRenderer: A concrete implementation is suitable.
- SvgElement.ElementName has been changed to non-virtual and is set by the parser instead of the   developer having to specify it when developing the class.
- Added more XML API documentation.

- Added initial custom/querystring 'parameters' implementation (#5652)