Sync ChangeLog with relevant parts from libdvdnav's. Rename to reflect split.

ChangeLog

-libdvdnav /4.1.3)
+libdvdread (4.1.3)
   * an embarassing amount of fixes regarding potential memory and resource leaks
     (patches contributed by Erik Hovland)
   * added dvdread-config (dvdnav-config's younger brother)
+  * split dvdread to a separate tree
+
 libdvdnav (4.1.2)
   * multiple build system fixes
   * added dvdnav_describe_title_chapters(title) to get title and chapters