Embedded font support

Just a heads-up about a new feature I just added: you can now load TTF fonts directly from memory, to make it simple to embed fonts in your apps in a nice, easy cross-platform way.

Very straightforward to use: there's now a new version of Typeface::createSystemTypefaceFor() which takes a block of memory as its argument. This could be from your BinaryData, or loaded from a file, or anywhere else, as long as it's some kind of TTF/OTF data that the system font parser can handle.

Works on OSX/Windows/Linux (I've not done android yet though). Enjoy!