Experimental: add more phone numbers

In VCF Files, you can have additional numbers with renamed item names. These are stored as number and label in 2 consecutive lines, so parsing line-by-line will not work, also these lines don't start with "TEL".

This experimental version adds those numbers, too, but without the label. I don't know, if this is useful, but at least they are in the list now.

For a more sophisticated including of renamed numbers, the complete file-parsing must be rewritten. Anyone who has spare time can feel free to add this and send a pull request.