Yay, you can now write an SVG from a Graphic object!

This includes a bug fix for SVG files that contain paths with numbers written with exponents.

This version upgrades the SVG support. Specifically ArcTo works more reliably on iOS and Mac. This also fixes SVG parsing bugs that prevented loading many SVG files.

A few properties have been added to IImage to fetch its dimensions.

There is no Mac editor included in this release (yet) because of a Xamarin bug: https://bugzilla.xamarin.com/show_bug.cgi?id=32895

This adds Direct2D rendering, better text handling, and more SVG support.

This is the first public release of NGraphics.