chore: import upstream snapshot with attribution

minecraft/change_version.cgi

@@ -0,0 +1,23 @@
+#!/usr/local/bin/perl
+# Update the current version
+
+use strict;
+use warnings;
+no warnings 'redefine';
+no warnings 'uninitialized';
+require './minecraft-lib.pl';
+our (%in, %text, %config);
+&ReadParse();
+
+my @vers = &list_installed_versions();
+my ($v) = grep { $_->{'file'} eq $in{'ver'} } @vers;
+$v || &error($text{'versions_echange'}." ".$in{'ver'});
+if ($in{'restart'}) {
+	&stop_minecraft_server(1);
+	}
+&save_minecraft_jar($in{'ver'});
+if ($in{'restart'}) {
+	&start_minecraft_server();
+	}
+&webmin_log("changeversion", undef, $in{'ver'});
+&redirect("");