Replace references to static writefile with write so we end up with only a single read and a single write function

following promotion of DRTVWR-497

Complete the change from lldiskcache -> llfilesystem and then addition of new lldiskcache implementation

Rename lldiskcache.* to llfilesystem.* - i think this is the right name since it's responsible for performing file system operations and (will eventually) delegrate to a separate disk cache component to save/load data and keep track of metadata etc.

Merge 6.4.9 into DRTVWR-497

SL-13522 remove injected character lights to improve alpha lighting in edit mode

Approved-by: Michael Pohoreski

following promotion of DRTVWR-503

Character lights injected during render pass while in character edit mode
(i.e. mSpecialRenderMode == 3) were causing discrepencies between deferred
(ALM) and forward alpha blend lighting.

Remove references to VFS in the non-English language XML files (already removed from English (en) versions)

The folder where the disk cache lives was originally renamed from llvfs to llcache but @henri's suggestion that that doesn't reflect the other files in the same place and it should be llfilesystem is a good one so I changed it over

DRTVWR-4976 Misc shader cleanup.

Approved-by: Michael Pohoreski

Renamed the references to LLVFile and llvfile.* source code plus cmake scripts to use a different name - lldiskcache - since that more closely resembles what it is (or will be) now that the VFA is no more

First part of change to remove LLVFS from the Viewer. Consists of code changes to remove LLVFS and LLVFSThread classes along with the associated source files. The existing llvfs folder is renamed to llcache. Also includes changes to CMake script in many places to reflect changes. Eventually, llvfile source file and class will be renamed but that is not in this change.

Removed some potential div-by-0 NaNs and a mangled clamp.

SL-13768 revisited, remove moon glow from ALM (deferred) path as well

Approved-by: Michael Pohoreski

Revert "SL-13768 Remove glow from moon when sun is down due to it using the sun glow setting (pull request #297)"

Revert "SL-13768 Remove glow from moon when sun is down due to it using the sun glow setting (pull request #297)"

SL-13768 Remove glow from moon when sun is down due to it using the sun glow setting

SL-13465 B

SL-13830 Remade vivox shutdown to terminate when it is told to shutdown instead of when viewer is quiting

Got into D503 by accident

Effective rename of DRTVWR-506-simple since there is no way to rename a branch. Cloned canonical viewer into DRTVWR-519, copied over the files that changed from DRTVWR-506-simple and pushed back.  Once I am satisfied everything is correct, DRTVWR-506-simple will be removed