Db 3 0 - Githubissues

Implements DB 3.0 for online sync and statistics, only the database parts.

This contains the following changes:

[x] Add categories
[x] Add UUID support for lists, entries, training progress
[x] List UUID tombstones to allow online syncing
[x] Entry UUID tombstones to allow online syncing
[x] Category UUID tombstones to allow online syncing
[x] Changed date for lists,entries and categories
[X] Replace manual auto-increment with the row-id hack of sqlite link
[X] Replace dual-key for entries with one row-id based entry key
[x] Add a per entry training history, to allow syncing
[X] Use cascading delete and foreign keys mostly everywhere (except for session meta data that is essentially a string:string hashmap)
[X] Remove KEY_CREATED and KEY_CORRECT from entries as only deltas can be synchronized and splitting online/offline user code isn't sustainable.
[X] Migrate a bunch of things to kotlin while doing so and use auto parcelize for VEntry and VList, also enforcing changed + created dates.
[X] Replace the legacy "table" and "voc" names with "list" and "entry".
[x] Generic settings table that can be synced
[x] Shared-Flag for lists
[x] Upgrade path for old DBs
[x] optimize entry tombstone by deleting them on list deletion
[x] enforce non-null for foreign refs
[X] migrate a bunch of tests to the new junit setup, fixing CI

Part of

0xpr03 / VocableTrainer-Android