SL-10238: Viewer spport for push notifications from the simulator contaiting partial groups of settings.  Blend these settings into the current environment.

SL-10093: Client code to support experiences changing an environment.  Handle generic messages with "commands" to be executed.

Remove compilation and linkage of deferredUtil and indirect GLSL helper objects (current source of Intel ig4icd driver crash).

SL-966 - animated object size/pos constraints cont, including some settings for debugging. additional options to anim_tool.py for making test animations

MAINT-7699: More robust cap protocol, better support for delete and support for individual tracks, support for setting environment by asset id in the cap
MAINT-7703: Initial flags sent in message protocol for parcels

The nghttp2 autobuild package has copyright information that embeds a newline.
autobuild install --copyrights correctly produces that information onto two
lines. But that means packages-formatter.py must process any lines that do not
match its expected 'packagename: copyright' pattern as the continuation of the
preceding package's copyright information.

Since the processing for autobuild install --versions is so very similar, fold
both into the same outer loop.

Also report all duplicates for any package, instead of stopping at the first.

SL-751 - updated lsl test scripts with bug fix, added a version that uses the new command llGetObjectAnimationNames()

Added cycle_object_animations.lsl. Also change to test.cpp to see if it affects a g++ internal compiler error.

SL-409 - added tracking for bytes fetched to viewer assets metrics (does not currently work for textures)

SL-109 - added another diagnostic option for skel_tool.py. --slider_info dumps the info about bone-affecting sliders to stdout

SL-315 - arche_tool.py updates, resetSkeleton() now preserves mPelvis state, forces all params to be updated.