Updates and New Pens

[lschwetlick]

Im not sure how best to approach this, but the rm2svg script here is quite outdated. I just finished fixing the version I use to work with the current file format and new pens (see here). Obviously not 100% perfect reproduction of the pen strokes but Im quite happy with it and it may be useful. It has diverged quite a bit from the original though so I thought I would ask if you would be interested in merging my changes back and whether I should make a PR.