Code for processing and converting Fontrix fonts

[markdavidlong]

Continuing with the theme of Font Converters...

This is a Converter subclass to process Fontrix fonts. It has options for showing the data in a linear fashion or in a grid and for removing inter-character spacing (useful for some fonts that are designed to scrunch up together.) I have also added a Fontrix-notes.md file and added a sample font (SET.BENGOT) to the dos-files.do.gz file. I've given the code and documentation a good once-over, so I hope formatting and such will be pretty solid. I've tested the code with about 40 fonts or so and it seems to be pretty robust.