Update most URLs to use HTTPS if available, and fix some dead ones too.

extras

@@ -1,7 +1,7 @@
 #!/usr/bin/env perl
 
 #
-# Script taken from InspIRCd, www.inspircd.org
+# Script taken from InspIRCd, https://www.inspircd.org/
 #
 # This program is distributed in the hope that it will be useful, but WITHOUT
 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
@@ -9,7 +9,7 @@
 # details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #