Make a protobuf based backup system (#112)

* Make a protobuf based backup system, restore not tested

* Fix a number

* Remove uneeded change

* Remove more uneeded changes

* Use 1.x style models, backup should be 100% compatible with the 1.x backups

* Fix restore service not running

* Fix offline chapter restore
Cleanup saved searches restore(untested)

* Implement onlione/offline option, fix merged manga restore online, fix restore total

* Allow setting auto backup to use a full backup

* Fix for saved searches restore

* Edit some comments

* Convert flows back to observables

* Fix a model

* Fixes and comment only the SY specific things

* Move SY values range to 600 from 60

* Combine legacy and full backup services into one
Deduplicate a lot of code
Simplify a lot of stuff
Modify comments

* Cleanup

* Remove unneeded protobuf config edit because its now the default

* Migrate to kotlinx.serialization for backup saved searches

* Cleanup saved searches more, move gson type adapters to the legacy package

app/src/main/java/exh/EXHMigrations.kt

@@ -5,7 +5,7 @@ import com.elvishew.xlog.XLog
 import com.pushtorefresh.storio.sqlite.queries.Query
 import com.pushtorefresh.storio.sqlite.queries.RawQuery
 import eu.kanade.tachiyomi.BuildConfig
-import eu.kanade.tachiyomi.data.backup.models.DHistory
+import eu.kanade.tachiyomi.data.backup.legacy.models.DHistory
 import eu.kanade.tachiyomi.data.database.DatabaseHelper
 import eu.kanade.tachiyomi.data.database.models.Chapter
 import eu.kanade.tachiyomi.data.database.models.Manga