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

Replaces g_ascii_strup() and allows building the Vorbis encoder
without GLib.

The null byte is whitespace, too.

Replaces g_str_has_suffix().

Replaces g_strstrip().

Replaces GLib's g_str_has_prefix().

Replaces GLib's g_ascii_strcasecmp().

Overload the name.

Eliminate the fallback strndup() and strnlen() implementations.

Usually, when strndup() is not available, strndup() isn't either,
because both are POSIX 2008.

This patch also adds extern "C" { } wrapper around string_util.h
to allow its usage in C++ code

Replace g_strchug() calls with a cheaper implementation.

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.

Renamed functions.

This is a rather huge patch, which unfortunately cannot be splitted.

Instead of using our custom ioops.h library, convert everything to use
the GLib main loop.

Merged freeAllListenSockets() into closeAllListenSockets(), because
this is its only caller.

"LOG_H" is a macro which is also used by ffmpeg/log.h.  This is
ffmpeg's fault, because short macros should be reserved for
applications, but since it's always a good idea to choose prefixed
macro names, even for applications, we are going to do that in MPD.