Build message threads after each sync and store thread root ID for later reference

[ChristophWurst]

This makes use of the jwz algorithm added via another PR. This focuses on the integration part, not the threading algorithm. So if any thread is assigned the wrong ID -> I don't care here as long as some thread root ID will be assigned :P

• Requires Store the references, in-reply-to and the thread root id #3337 to load real data and write back the updated root IDs
• Requires Implement the jwz threading algorithm #3355

To test this:

• Switch wo this branch
• Use mail as you normally would

Expected outcome:

• Don't notice any difference
• The thread_root_id of your oc_mail_messages will slowly populate with values

Ref #17 (not fully done yet)

[rullzer]

saw it in action. gogogo

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