Followup on mapbuffer work -- only use map buffer where map_buffer_range is available, and allow non-buffer-mapping implementation to take advantage of recorded mapped regions.

* Fixed ATI mac "lighting and shadows" related crash
* Fixed up numerous GL errors on macs related to multiple color formats,
  the use of glEnable/glDisable on textures above the texture unit count
  and old ATI-specific code that was not appropriate for Mac.
* Disabled SSAO for ATI macs due to it not working with shadows
* Ongoing work to properly get shadows and SSAO functioning on ATI macs is required.

Reviewed by davep

* Disabled SSAO on macs with 8 or less texture units.
* Slight cleanup of sunlight fragment shaders to remove unused texture units.

Reviewed by davep

* Modified mac feature table to bring it up to date with latest renderer features including deferred rendering
* Changed mac AGL pixel format to no longer allow it to revert to software rendering when shader compilation errors occur.
* Fixed up various GLSL shader compilation warnings and errors that came up as a result of the above changes.
* Changed initial conditions for the "hardware skinning" checkbox on the preferences floater so it can be modified before login on machines that support avatar vertex programs.
* Removed unused avatarAlphaF.glsl files

Reviewed by davep

SH-1387 Class0 video cards default avatar physics to high

Added appropriate featuretable entries.

SH-1387 Class0 video cards default avatar physics to high

Added appropriate featuretable entries.

Eliminated more merge artifacts.

Revert to previous behavior.  Reflections stay at "minimal".

First implementation with UI changes.

VWR-21349 Don't enable FBO by default on mac or linux when using high/ultra graphics.  Cap samples in LLMultiSampleBuffer to 4 samples to avoid using tons of memory when RenderUseFBO is set to TRUE and RenderFSAASamples is > 4.  Don't allocate multisample buffers at all when RenderUseFBO is FALSE.

VWR-21349 Don't enable FBO by default on mac or linux when using high/ultra graphics.  Cap samples in LLMultiSampleBuffer to 4 samples to avoid using tons of memory when RenderUseFBO is set to TRUE and RenderFSAASamples is > 4.  Don't allocate multisample buffers at all when RenderUseFBO is FALSE.

SH-157 Add "RenderLocalLights" to preferences and featuretable to replace old local lights on/off radio group.

SH-287 FIXED Anti-aliasing setting does not take effect until relog

Added logic to control RenderUseFBO setting based on graphics quality.  RenderUseFBO controls whether anti-aliasing is enabled.

STORM-1126 WIP Windlight Estate Settings port from 1.23: first pass at merging in windlight estate settings to viewer-dev codebase.

not built, not tested. Probably needs a bunch of fixes to be able
to be integrated.

(resubmitted by Vadim ProductEngine)

Add featuretable_xp, set default VolumeLODFactor to 0.5 for class 0 hardware, and disable impostors on Intel 965 on xp.

back-out the back-out for this branch.  yay.

Backing out this merge that I pushed (prematurely) to the wrong place.

Fixes for DEV-50619 Have the low graphics settings be the lowest possible settings for settings with slider bars and DEV-50618 Have Draw Classic Clouds be off for low graphics settings and DEV-50616 Toggling Draw Classic Clouds does not actually prevent them from being drawn if clouds have been drawn once.  Reviewed by qarl

set RenderAvatarMaxVisible to be 3 by default for low-end settings.

EXT-2973 : turned off RenderDelayVBUpdate for all platforms and bumped feature table to apply it.  Should solve index buff overflows.

Reviewed by Davep

svn+ssh://svn.lindenlab.com/svn/linden/branches/viewer/viewer-1.23.threefour-merge-1a

QAR-1592 Merge of changes between 1.23 RC2 and 1.23 Final to trunk

svn merge -c 106471 svn+ssh://svn.lindenlab.com/svn/linden/qa/viewer_1-22-106055_merge

QAR-992 Merging revisions 101012-101170,101686-101687 of svn+ssh://svn.lindenlab.com/svn/linden/qa/viewer_combo_1-22-merge into linden/release