But change shortcuts and registry entries and everything else back to the real
viewer executable, so that every subsequent run directly launches the viewer.

Eliminate SL_Launcher references from viewer_manifest.py.

codesign claims to succeed, but spctl says:
/Volumes/Second Life Installer/Second Life Test.app: rejected
(the code is valid but does not seem to be an app)

Why not? Display what's in Second Life.app/Contents on the mounted
sparseimage: show Info.plist, list Frameworks, MacOS, Resources.

The start of viewer_manifest.DarwinManifest.construct() is a path() call to
copy the whole viewer tree from where CMake constructs it. The comment is:
"(this is a no-op if run within the xcode script)." Unfortunately, for unclear
reasons, this has recently started nesting Second Life.app within the Second
Life.app directory, and even to multiple levels. When that happens, copying
the outermost .app directory to the sparseimage in order to convert to dmg
runs out of room because we're trying to pack multiple copies of the whole
viewer tree into the fixed-size sparseimage.

But if it works to simply skip that entire initial copy operation, so much the
better.

We'll try to address the Mac app bundle name discrepancy a different way.

The relationship to MAINT-9047 is that we hope this will improve the behavior
of Mac code signing.

Roll back optimization that breaks cubemap updates

Approved-by: Andrey Lihatskiy <andreylproductengine@lindenlab.com>

Roll back optimization that isn't needed for sky rendering when atmospherics are used, but is needed for cubemap update.

MAINT-8260 make TextureLoadFullRes not persistent to avoid issues with accidentally setting it on systems which cannot handle the mem load it implies