Add generic CSV export

[bmix]

It would be nice, to have a generic CSV export, that does not target any phone/platform, so one could convert any of the possible import formats into a generic CSV.

Use case example:
I am currently fixing a macOS address-book export for a relative, so it could be imported into a Telekom Speedport. Workflow would be:

1. export from macOS AddressBook as VCARD
2. eventually fix charset issues via iconv
3. import VCARD into CCW
4. let CCW convert VCARD into "Generic CSV" and saving it
5. import "Generic CSV" into LibreOffice Calc
6. fix data and arrange for final output format
7. save data from LibreOffice Calc in the desired CSV format
8. import that into Speedphone

Thank you.

[tryallthethings]

You could try using the Aastra CSV export for the time beeing.