release v0.22.5

Needed for `requestLegacyExternalStorage` (commit ca02fb77).

The "move" command doesn't allow open-ended ranges because they don't
make a lot of sense; moving an open-ended range is only possible if
the destination index is before the range, and in that case, the
client should be well aware how many songs there are.

Closes https://github.com/MusicPlayerDaemon/MPD/pull/1057

Catch errors like that early, before invalid ranges get passed to
internal MPD subsystems.

This is a workaround for the new scoped storage design in Android 11:

 https://developer.android.com/about/versions/11/privacy/storage

This needs a proper solution eventually, but this quick fix will do
until we change "targetSdkVersion" to 30.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1061

After commit 1afa33c3, an old bug was revealed:
SimpleDatabase::GetSong() constructs an ExportedSong instance by
moving the return value of Song::Export(), which causes the
LightSong::tag field to be dangling on the moved-from
ExportedSong::tag_buffer.  This broke tags from CUE sheets.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1070

Keep track of whether there is data being played, and don't call
AudioOutput::Drain() after Cancel() has been called already.

In this state, we can't make any progress.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1084

Drain only if it was requested explicitly.

It is useless, because we're always checking pa_stream_is_corked().

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1022

Add cacert option for curl plugin

    add cacert option for Curl plugin. Allows to set cacert for curl lib
    Added documentation line into doc/plugins.rst with explanation for cacert option

This is semi-standard and doesn't require the util/Compiler.h header.

Throwing std::runtime_error was slightly wrong.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1031

Commit 79b23663 added the field `skip`
to support unaligned reads, but set the `offset` field to a wrong
value.  This resulted in miscalculation of `remaining`, causing
an assertion failure.

The fix is to assign `offset` the correct value, but consider the
`skip` value in the assertion.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1067

After a Seek() to an odd offset, some data needs to be skipped from
the start of the block, and reading right into the given buffer
doesn't work.