Migrate to new sqlcipher package

[raphaelm]

Google play marks the SQL cipher package as an outdated SDK and might block app releases in the future. This PR does the migration and unfortunately needs to vendor some requery code for that.

[robbi5]

This is also an upgrade from the sqlcipher major version 3 to 4.

https://discuss.zetetic.net/t/upgrading-to-sqlcipher-4/3283 says:

However, the introduction of new default algorithms, increased KDF iterations and a larger page size means that SQLCipher 4 will not open older databases by default.

We should do the PRAGMA cipher_migrate; call, or am I missing some place where it happens implicitly?

[robbi5]

Well, we don't do a automatic migration, but it looks like we kill and rebuild the database:

https://github.com/pretix/pretixscan-android/blob/master/pretixscan/app/src/main/java/eu/pretix/pretixscan/droid/PretixScan.kt#L54-L58

[raphaelm]

ouch! how did i not notice that. no, that's not he goal xD

[raphaelm]

Oh wow, they could really have mentioned this or given better guidance :D Fixed!