Consistency across class2/3/ALM lighting.

Mods to improve alpha obj render performance.

Removes hacky fix for HUD elements getting atmospherics.

Re-orders rendering of glow to remove ~10ms/frame of shader re-re-rebinding.

Fix up default classes and basic shader loading (remove unused shared modules).

Eliminate 20+ callsites with copy-paste of getPosition and/or getNorm code.

Make pipeline use getShadowTarget/releaseShadowTarget consistently.

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.

--HG--
branch : develop

FITMESH-6, FITMESH-20  Fix for some objects disappearing when hardware skinning enabled and ALM disabled.

MAINT-3330 fix regression on mac caused by shader change for 3107 by rolling back to prev version of shader

Up bone cap to 64 for rigged meshes.

MAINT-3107 speculative changes to try to ameliorate rigged crasher on Intel HD with crappy default driver

MAINT-2800 revert changes to objectSkinV to make it match 3.6.0 code and not slow down on ATI on Mac

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.

SH-2507 Shave some unused/redundant varying state and make the max texture index debug setting rebuild shaders to use no flow control when set to 1 or lower

SH-2243 work in progress -- don't use gl_FragColor or gl_FragData for outputs -- no more deprecation warnings on nvidia