SL-17573 Add "dynamic" checkbox, also followup on SL-17551 and do "Select Invisible Objects" checkbox instead of "Select Reflection Probes"

Pulled in and updated Rider's changes

SL-12902 Fix for doing the technically correct but compatibility wrong thing WRT light color values.

Will wait for a response from @graham_linden regarding moving the sRGB conversion functions in llmath.h to llrender.

Make sure lights are in the correct color space.
Bonus: cache the sRGB color in setLightColor on point and spot lights.  Frees up a pow and some multiplies on the CPU every frame.

SL-694 - Added extra param field for flags related to extended mesh functionality. Currently this is just one bit to flag an object as able to animate

MAINT-6645 - Improvement - Agents that render as jelly dolls should have their attachments render at 0 LoD to prevent loading higher LoD complexity in memory thus deterring crashes.
Comments:
- Fix based on "RenderAutoMuteByteLimit" setting.
- File indra/llxml/llcontrol.h - add all signals to 0 group.
  It garanty that handlers (in indra/newview/llviewercontrol.cpp) will be called last.

Need backed out this changes because it influence on material
update see: MAINT-5818
Also this lead to the following:
UserA and UserB logged in same location.
UserA edit normal/specular map texture offsets while UserB is not observe this
changes.

MAINT-3548 - FIXED-R2 Horizontal & vertical offset values for normal & specular maps still randomly revert to previous settings when building.

MAINT-4092 FIXED Prim faces with opaque diffuse maps, with material set to ALPHA_MODE_BLEND, do not render
MAINT-4645 FIXED [viewer-lion] The build tool shows normal or specular map as 'none' when one exists

consolidated most indra-specific constants in llcommon under indra_constants.h
fixed issues with operations on mixed unit types (implicit and explicit)
made LL_INFOS() style macros variadic in order to subsume other logging methods
such as ll_infos
added optional tag output to error recorders

Cherry pick of https://bitbucket.org/lindenlab/mesh-development/changeset/9cea44ebea3b by don, to fix old viewer crashes in mesh regions