Add support for distant field fonts

[bitbrain]

Currently, it is very difficult to define fonts which scale automatically with screen sizes. There are different approaches:

• generate TTF fonts dynamically based on current screen resolution. On rescaling viewports these fonts need to be rebaked and styles need to be re-initialised. This becomes very problematic and also it does not scale very well with viewports
• use distant field fonts (does not work with TTF fonts) see wiki