Log Message:
Update Gorm to 1.2.18.

Noteworthy changes in version `1.2.18'
======================================

   * Code cleanup, removal of warnings when building with clang.

   * Removal of use of call to objc_poseAs(..) which was preventing
     building with newer runtimes.

   * Stability improvements.

Noteworthy changes in version `1.2.16'
======================================

   * XIB reading.

   * Bug fixes for standalone views.

   * Stability changes.