Anonymiser 1.1-beta1

New features

• [#7] Anonymise by runner for larger contact groups by @bjendres
• [#10] Settings page by @jaapjansma
• [#11] Anonymise action (e.g. for FormProcessor) by @jaapjansma

Bugfixes / Compatibility

• [#12][#13] Custom data is not cleared by @jaapjansma
• [#14] Anonymising fails if contact has tags by @jaapjansma

Most of the credit goes to @jaapjansma here, for advancing this project.