svn merge -r 69597:70080...

svn merge -r 69597:70080 svn+ssh://svn.lindenlab.com/svn/linden/branches/Branch_1-18-3-Viewer --> release

Merge patches made in the 1-18-3 RC iterations into the trunk.
* SL-55085 Login hangs if optional update is declined.
* SL-55123 Mac app icon missing from open source tarball
* SL-55121 Mac mouse cursors missing from open source tarball
* SL-54978 Remove duplicate code that snuck in during a patch merge
* SL-54633 VWR-2378: Failure to enable the "Update" button in the profile/classifieds tab, after a "Set Location" update
* Release notes/version numbers