Sync to WebODF 8d8fc0216874b9dd9e3e3eef68dd2474a11f02f3.

This sync brings collaborative virtual selections in iOS Safari.

A selection can only be triggered by long-pressing on a word. The resulting selections has two circular handles, one at the start and the other at the end, both of which can be dragged around.

Note: OwnCloud Documents master is currently broken. Clicking 'edit' to open a document via the Files app takes me to the Documents app (with the thumbnails) which says "Loading documents". Clicking 'new document' does nothing at all.

The selections are working fine on the upstream WebODF editor but I have no way of testing them with owncloud. I don't see any reason why they wouldn't work though. But please fix and test.