Webdav support for browser bookmarks

[markc]

Baikal version: latest

Problem you are having:

Google dropping sync support for Chrom* based browsers.

Suggested solution:

Add minimal Webdav support to Baikal so a bookmarks.xbel file could also be stored for syncing between browsers. I'm not suggesting Webdav support for file storage in general, just browser bookmarks and tab settings (ie; what Floccus supports).