Merge locate_song_search() and locate_song_match().

Fold the case during construction, without having to create another
copy.

Convert a string into a tag_type enum.

After we've been hit by Large File Support problems several times in
the past week (which only occur on 32 bit platforms, which I don't
have), this is yet another attempt to fix the issue.

Convert a string into a tag_type enum.

strcasecmp() is locale dependent, making it a bad choice for internal
string comparisons.

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.

There's no point in declaring num_items as a uint8_t, it doesn't save
any space, due to padding.  This allows us to lift the articial "255
items" limitation.

Renamed numOfItems to num_items.

On some platforms, g_free() must be used for memory allocated by
GLib.  This patch intends to correct a lot of occurrences, but is
probably not complete.

Merged casefolding code from two locations into this one library
function.

Changed the function prototypes to get locate_item_list objects
instead of num_items/items.

Instead of passing two parameters around (number of items, array of
items), combine both in a variable size struct.

The declaration initialized only the first element.  Initialize the
whole array with memset() instead.

Use the C99 bool type instead of integer values (1/0 or 0/-1).

Renamed functions and variables.

No CamelCase and no typedefs.

Pass const pointers where no writes are performed.

Yesterday's patch set changed tagItemFoundAndMatches() and moved the
strcmp() return value into a bool, but forgot to add the ==0 check.

The function strstrSearchTag() used g_utf8_casefold() to generate the
(pseudo-)lowercase version of the song's URL, but it never used the
variable.

string_toupper() and strDupToUpper() were not able to deal with
character sets other than US-ASCII.  Use GLib's g_utf8_casefold()
for strings.

CamelCase is ugly...  rename all functions.

Again, a data type which can be forward-declared.

Seeing the "mpd_" prefix _everywhere_ is mind-numbing as the
mind needs to retrain itself to skip over the first 4 tokens of
a type to get to its meaning.  So avoid having extra characters
on my terminal to make it easier to follow code at 2:30 am in
the morning.

Please report any new issues you may come across on Free
toolchains.  I realize how difficult it can be to build/maintain
cross-compiling toolchains and I have no intention of forcing
people to upgrade their toolchains to build mpd.

Tested with gcc 2.95.4 and and gcc 4.3.1 on x86-32.