Update VOKAL icon set

The Green Mountain Library Consortium has updated the 'vokal' item type
image set to include new and updated icons, including:
Puzzles and Games
BLURAY
Hardware
Educational Media
Fiction, Nonfiction, New and Holiday books
ILL materials

Smaller versions of all the icons (32 px) are included as well.

Sorting of the icons has been included in this patch to group
large and small versions of these icons together, as well as make large
icon sets easier to visually scan (the 'bridge' set benefits from this,
as well) .

Signed-off-by: Galen Charlton <gmcharlt@gmail.com>

C4/Koha.pm

@@ -598,6 +598,7 @@ sub _getImagesFromDirectory {
     if ( opendir ( my $dh, $directoryname ) ) {
         my @images = grep { /\.(gif|png)$/i } readdir( $dh );
         closedir $dh;
+        @images = sort(@images);
         return @images;
     } else {
         warn "unable to opendir $directoryname: $!";