SL-12978 Refactor sun intensity calculation for smooth transitions.

Approved-by: Michael Pohoreski

Had to find a balance in the sunlight intensity calculation that behaves correctly for
both these issues.

SL-13768, remove moon glow from sky and clouds

Approved-by: Michael Pohoreski

SL-13721 Fix incorrect water reflection

Approved-by: Dave Houlton

SL-13743 Revert part of SL-12978 change that broke low-angle sunlight

Approved-by: Michael Pohoreski

Small change to CMake options to only enable the PreferredToolArchitecture=x64 option (required for 32bit TeamCity builds) on 32 bit builds generally - removes a ton of 'unknown option, ignored' spam in the build output

SL-13565, clean up now-orphaned throttling variable and handling code

Approved-by: Michael Pohoreski

SL-13565, remove SL-10625 throttling erroneously applied to all GPUs

Remove the sleep throttle applied in 10625 to work around an Intel GPU driver
bug. It was erroneously being applied to all GPUs, and also as of Intel driver
26.20.100.7755 (1/9/2020) it appears that the driver bug no longer exists.

Merge master 6.4.8 into DRTVWR-497

following promotion of DRTVWR-501

Approved-by: Dave Houlton

Merge master v6.4.7 to LMR#4 DRTVWR-497

to reflect previous commit and use correct pool size

following promotion of DRTVWR-476

This reverts commit bf999f2f due to revert of updater, this will be moved to separate 'epic' instead

This fails at teamcity due to missing LLTrans, but builds locally without issues. Reverting to not hold D501

SL-13521 Add avatar appearance lighting to deferred lighting path

Approved-by: Andrey Kleshchev
Approved-by: Michael Pohoreski