Fix up copyright and license notices for St

* Make sure all source files have a LGPL copyright header, and standardize
  non-standard variations of the header to a common form.

* Check and update all copyright notices.

* Remove 'Written By:' lines. They are universally incomplete and
  typically indicate only who started a particular file.

https://bugzilla.gnome.org/show_bug.cgi?id=634550

src/st/st-types.h

@@ -12,9 +12,7 @@
  * more details.
  *
  * You should have received a copy of the GNU Lesser General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- *
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
 /**