SH-2700 Fix for random black textures due to texture index out of bounds.  Also change shader to show bright pink on index out of bounds and add assertions to help prevent this sort of bug in the future.

SH-2428 Make GCC 4.4 happy by using LLVector4a striders with LLAlphaObject subclasses -- also vectorize particle VBO updates

SH-2447, SH-2525, SH-2276 Strip out defunct global illumination code, add accounting for how much memory is taken up by LLRenderTarget, fix crash on login in bindGLIndices (work around driver bug that doesn't respect VAO state WRT to index buffers), remove some unused render targets, remove some unused shaders, make it possible to run a fullscreen session

SH-2276 Fix for failed assertions reported from debug-enabled viewers.  Also, remove "Basic Shaders" as a user settable option (shaders are always on if GL version >= 2.0, always off otherwise)

SH-2244 changes to run in a core context on AMD hardware without generating deprecation or performance warnings

SH-2244 Vertex buffer cleanup, fix for bad vertices in rigged attachments, added "RenderUseVAO" debug setting to control whether or not to use VAO's in non-core GL profiles.

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

SH-2242 Physics shape display works again, added asserts to flush out areas where state being consumed by a shader does not match state being provided by vertex buffers.

SH-2238, SH-2223, SH-SH-2242 glVertexAttrib throughout main render pipeline complete, preview renders and debug displays still pending.  Also fixed a render glitch and a crash (JIRAs listed).

SH-2031 High risk changeset, but potentially high reward.  Addresses frame stalls in renderer by never using the fixed function pipeline if shaders are available.

SH-2038 Disable usage of stream vbo on mac and make flexi's use stream vbo if stream vbo disabled (effectively disables usage of vertex buffers for flexible objects on mac)

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

debug code for SH-692: Viewer Crash when enabling Render Metadata > Physics Shapes on Mesh Sandbox 25 on Windows XP

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.

Reviewed by davep.

Unused local varible removed.

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).

reviewed by davep.