wumpus-afm-loader

Copperbox revision 2829.

Work on a font metrics loader to eventually replace the one in Wumpus-Basic.

I was hoping to use a Perm parser to parse global font information, but unfortunately whilst Perm parsers accept "any order" they (seemingly) need to be able to recognize all attributes. This doesn't fit my purpose - I only want a small subset of the attributes - so I have to use a pre-processing step instead. The current implementation messes up line numbers.