This allows you to measure and draw text that has newlines. There's still some issues on WPF and Gtk where multiple paragraph strings won't align right/center each paragraph separately when wrapping is turned off, but this makes this immensely more useful.

Some additional changes:

• WinForms: Fixed issue where single lines or last lines in the paragraph were justified, but they should not be.
• Gtk: Improved performance of FormattedText in most cases, and caches the pango layout instead of creating it each time it is drawn/measured.