Updated header blocks for llphysicsshapebuilderutil classes.

STORM-1215: restore INSTALL_PROPRIETARY in Release builds, remove incorrect use of LL_RELEASE_FOR_DOWNLOAD from ReleaseOS

The reason was to manually resolve a couple of merge problems, as upstream has had several changes since this was applied, and some of the changes overlapped.

fix for SH-688: Viewer crash when uploading a large .dae file and clicking the X button in upper right hand corner of the upload model floater on Mac Build

missed else case

fixed crash on startup

Automated merge with bundle:E:\code\viewer-experience-merge+c:\users\richard\appdata\local\temp\thg.ia7ixc\http__hg.secondlife.com_viewer-development_csqen8.hg

EXP-749 FIX [REGRESSION] Voice status indicator shown in IM session instead of profile pic in Basic and Advanced modes

reviewed by Leyla

SH-1443 Fix for fullbright alpha objects not appearing for some combinations of deferred rendering and non deferred automatic alpha mask toggling.