Since we switched from autotools to Meson in commit
94592c14, we don't need to include
`config.h` early to properly enable large file support.  Meson passes
the required macros on the compiler command line instead of defining
them in `config.h`.

This means we can include `config.h` at any time, whenever we want to
check its macros, and there are no ordering constraints.

See commit 71f0ed8b

This eliminates some overhead, because the compiler doesn't need to
consider these functions throwing.

Make sure we're using the same EventLoop as the NfsManager.

Eliminate dependency on io_thread_get().

This allows eliminating the indirection code from the NfsConnection
destructor.

It's just a useless wrapper for class NfsManager.

More robust and cancellable.

Add the debug-only flag "virgin" which gets checked by assert()
calls.  Fixes assertion failures when using zeroconf/avahi.

Now that the remaining known bugs in poll() implementation are fixed,
we can go on without the GLib implementation.

This change adds two configuration options:

  --with-eventloop=[glib|internal|auto]
  --with-pollmethod=[epoll|auto]

First allows switching between GLib event loop and internal one.
Second chooses backend to use for internal event loop.
Conditional compilation symbols are changed accordingly.
Additional helper macro MPD_OPTIONAL_FUNC_NODEF is added as well.

Implement an event loop without GLib.

No caller needs this.  Fixes use-after-free after returning from
Client::OnTimeout().

Parses CUE data from the "CUESHEET" tag.  Needs further integration in
the update thread.

Pass a callback table to scan_file() and scan_stream(), instead of
returning a tag object.

Based on the APE reader.

Don't call g_error(), which will abort the process and dump core.

This updates the copyright header to all be the same, which is
pretty much an update of where to mail request for a copy of the GPL
and the years of the MPD project. This also puts all committers under
'The Music Player Project' umbrella. These entries should go
individually in the AUTHORS file, for consistancy.