Remove binding and use of glIsShader for now (only useful for avoiding warnings about deleting shader objects re-used across programs).

Make vograss objects set their face vert/index counts to 0 when setting
the number of blades to 0 to disable rendering so we don't allocate space
and then skip setting it up with actual index data in getGeometry.

MAINT-6913 - (Via Sovereign Engineer and Shyotl Kuhr) Pack the skinned matrix and translation into a single mat3x4 for optimal data transfer to reduce uniform slot usage.

Reviewed by Graham

cleaning up build
moved most includes of windows.h to llwin32headers.h to disable min/max macros, etc
streamlined Time class and consolidated functionality in BlockTimer class
llfasttimer is no longer included via llstring.h, so had to add it manually in several places

factored out lltrace::sampler into separate file
added rudimentary lltrace support to llstatgraph
made llstatgraph use param blocks more effectively
moves initial set of stats over to lltrace
removed windows.h #defines for min and max

MAINT-616 Factor out calls to glGenFoo where possible, add setting to control synchronizing strategy WRT occlusion queries, add experimental transform feedback driven LoD update

SH-2908 Rework indexed texture rendering to use a uvec4 instead of a float for texture indices in the data stream.  Also rework gl_FragColor overrides to not collide with some odd driver implementations.

another attempt at fixing gcc builds

SH-2244 Fix "RenderGLCoreProfile" actually make a core profile context and modify viewer to run under said context without generating errors.

SH-2244 Add "RenderGLCoreProfile" debug setting that allows the viewer to start with a non-compatibility-profile OpenGL context.

SH-2038 Fix for some compiler errors from the apple tweaks -- also add a fence API (disabled for now).

Reviewed by davep.

SH-1682 Use GL_ARB_map_buffer_range to mitigate impact of mapping larger vertex buffer objects.  Limit number of textures per batch to 6 (prevents frame stalls on NVIDIA).

Updated header blocks for llphysicsshapebuilderutil classes.

SH-874 Followup -- use GL_NVX_gpu_memory_info for NVIDIA chips to detect actual installed and available VRAM.

SH-373 Update glext.h, disable anti-aliasing on ATI when rendering deferred.  Get rid of RenderUseFBO debug setting (only use FBO when rendering deferred).  Use GL_ARB_framebuffer_objects instead of GL_EXT_...

Port of SNOW-643 : Water flicker at high altitude. This doesn't fix the low altitude flicker though (STORM-306)

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