While NON NULL seems to be accepted by sqlite, it appears to be silently
converted to NOT NULL, which makes the db consistency checks fail later
on

Since we now handle InsertionDate when sorting album, this test doesn't
test what it's supposed to.
Regression from !487

In order to avoid sprinkling 2+ line std::to_string invocations each
time we need to convert an enum value to a string in a SQL request

As model changed this become more and more unreadable, so let's refactor
it to match what other classes do.
This is much longer, but also much clearer

Fix #374

Instead of using the values stored in the instance. This will us to
flush the task list at any given time, and not have to wait until the
currently running task completes

This should help with the nbScheduled >= nbDone assertion that sometimes
triggers in vlc-iOS
(should) fix #375

The rest of the code assumes that scheduled >= done, so setting done to
0 first could briefly invalidate this assumption.
Note that this doesn't have any effect with relaxed memory order, which
will change in next commit

Fix #217

This reverts commit 8a9999b7.

We're already in the Artist class, no need to specify it

Fix #240

As it's done for other entity type, this will ease up generating the
request based on the sorting criteria.
For now it doesn't add an actual join

Refs #240

refs #240

This will prevent having to manually update that list every time we add
a new criterion

Fix #301

Incidently, this was working fine since the only invocation was passing
1 as both mediaID and time

We removed a couple of values, which was not reflected in the number of
entries

Regression from switching to meson

Commit d4024e56 added the x86-dispatch for all platforms which was
previously limited to x86 as dispatch support was not extended beyond
this architecture yet.

This reverts this minor part of the commit.