Fix for text when using Style="font:.."  format. e.g. style="font: bold 16px/normal 'trebuchet ms', verdana, sans-serif;"
Fix fr lowercase font family not being found.

https://github.com/vvvv/SVG/issues/23#issuecomment-25747963

Added support for multiple comma separated font lists, CSS style.

Get first font in font family only.

- Changes to get texts displaying bold / normal weight
- Changes to get textspans work correctly
- Made (semi-hardcoded) document metadata section - allow reading and regurgitating metdata tag from an original source document
- Included image
- Modified paths to allow for scientific notation
- Included ability to have markers for path ends (arrow ends etc)

* added precise MeasureString method

* fill can be null -> none in XML
* added type converters for enums
* added type converter for unitcollection
* fixes several viewbox bugs
* document can now draw into a given bitmap
* content of SVG tag is written (used by the text tag)
* changed font handling in text element, still need proper alignment
* changed intersparse character of SvgTransformConverter.cs to space, because inkscape couldn't parse comma
* added class diagram for basic shapes