Fix for: SL-15422 Update version of CEF used in the Viewer to 91.0.4472.101. Also includes a tweak to viewer_manifest.py to handle some CEF file changes"

Pull in updated Dullahan and use it for for: Fix SL-14888 Media on a Prim should not show JS (about to unload) popups

This reverts commit 07456abe, reversing
changes made to 8a33636e.

This reverts commit 4add069c.

Pull in new version of Dullahan with support for setting the host process path, tweak viewer manifest so it copies the SwiftShader folder (required but may be a Chromium bug) and improve background color matching

CPU based detection in case Intel HD Graphics got detected

This reverts commit eac0f185.

Due to crash inside uriparser's code

Switch Intel HD4000 and HD2500 off of forced 32-bit

Moved from D521

Simplify name generation according to slack discussion, also helps bugsplat with matching files

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

Due to some known crashes inside bugsplat and deprecated mac support