following promotion of DRTVWR-532

This reverts commit e61f485a, reversing
changes made to 00c47d07.

DRTVWR-528 merge up to 6.4.15

following promotion of DRTVWR-519

DRTVWR-528 merge up to v 6.4.14

following promotion of DRTVWR-517

DRTVWR-528 rebase to 6.4.13

DRTVWR-525, merge up to 6.4.13

SL-14706 Merge Sovereign Engineer's fix for stars not centered around camera: Stars render around center of sim instead of center of camera.

Approved-by: Dave Houlton

SL-14732 Undefined behavior in class2 windlight cloud fragment shader

Approved-by: Dave Houlton

SL-14731: Fix sun gamma -- merge Sovereign Engineer's patch: Fix sun gamma space for accurate color reproduction of sun textures

Approved-by: Dave Houlton

following promotion of DRTVWR-513

SL-14706 Merge Sovereign Engineer's fix for stars not centered around camera: Stars render around center of sim instead of center of camera.

SL-14732: Merge Sovereign Engineer's cloud patch: Fix writing outside outside of the bound fbo in forward render class2 cloud shader

SL-14731: Fix sun gamma -- merge Sovereign Engineer's patch: Fix sun gamma space for accurate color reproduction of sun textures

SL-13490 replace imperfect object-sized normals/tangents with constant length

SL-13490 fix debug normals under non-uniform scale

Approved-by: Michael Pohoreski

SL-14705: Merge Sovereign Engineer's fix for name tags showing in front with AMD GPUs: Fix GL_INVALID_OPERATION when copying stencil to default window framebuffer on AMD graphics on windows

Approved-by: Dave Houlton

SL-14705: Merge Sovereign Engineer's fix for name tags showing in front with AMD GPUs: Fix GL_INVALID_OPERATION when copying stencil to default window framebuffer on AMD graphics on windows

SL-14707: Merge Sovereign Engineer's fix for clouds: Clouds are unusually dim in EEP

Approved-by: Dave Houlton