"DEFAULT" is a bad name - all it says is that it's the default value,
but it doesn't say what it means.  The name NOTICE mimics the syslog
level.

The log levels have always been very confusing (and badly named), but
this was most confusing: if there's a log level called "default", why
is it not the default?

Closes https://github.com/MusicPlayerDaemon/MPD/issues/926

Prepare for templated functions.

The former was deprecated with C++14.

According to the C++11 and C++17 standards, both files are identical.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

This is the documented value, but for unknown reasons, "info" was
really the default.

This was never noticed because there are only very few "info" level
messages.

Prepare for templated functions.

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.

A Java object to send logs on the android side.

Only _WIN32 is defined by the compiler, and WIN32 is not standardized
and may be missing.

Closes #169

Always write UTF-8 to the log file.

setvbuf() does not seem to have an effect on Windows.

Eliminate duplicate code.

Allows building without GLib.  This fails to compile currently,
because GLib is still used in the MPD core.

Prepare for GLib removal.

Reduces header dependencies.

Replaces GLib's GError.

Remove a GLib dependencies from class EventLoop and DatabaseLock.