Add Text Outline Support

[CryZe]

This should mostly just be a stroke rendering in our renderer and some CSS in the web version. Fairly trivial to support.

[CryZe]

There are two possibilities here: We either render the stroke first and then the fill or vice versa. It looks like rendering the stroke first is the way to go as otherwise the glyph intersecting itself (which is a thing) would cause really ugly artifacts.