Switch to NoSQL with server sync capabilities

[mvysny]

Currently Aedict's way of storing data is really REALLY old and crappy, you can read about this more here: https://www.patreon.com/posts/true-cloud-7533022

So, the logical solution is to move to NoSQL databases with server sync capabilities. Possible solutions are:

1. CouchBase Lite
2. https://github.com/couchbaselabs/TouchDB-Android - deprecated and they moved to CouchBase so goto 1
3. http://www.iboxdb.com/ - interesting, but the sync looks weird, I'm not sure whether the sync works over a TCP/IP connection

The problem with CouchBase is that the ForestDB engine is untested and buggy: https://github.com/couchbase/couchbase-lite-java-core/issues/1536 https://github.com/couchbase/couchbase-lite-java-core/issues/1533
https://github.com/couchbase/couchbase-lite-core/issues/42

I'm not sure whether I wish to use the SQLite engine - it's slower and it's getting replaced by the ForestDB engine.

[mvysny]

Implemented in Aedict Online and Aedict 3.39.28

[mvysny]

Please read https://www.patreon.com/posts/aedict-online-on-7838397 and https://www.patreon.com/posts/its-done-and-out-7893290 for more information for more information about how it works and how to enable it.

Basically, the sync now works in scope of individual notepad entries: every notepad line now has an ID - if that line is deleted, the delete is propagated to all devices. It is a huge improvement over previous backup/restore style which would simply zip entire notepad and overwrite anything you had on your device.