[Viewer/Build]
- changed : compiler options for "Release with Debug" builds
- changed : compiler and linker options for "Release" builds
- changed : removed LL's changeset tags and added new (consistent) SL-2.X.Y tags for releases
- changed : break into the debugger rather than forcing the process into an unrecoverable state for "llerrs" on non-release builds
    -> Windows only
- fixed   : *OS builds don't set the default Visual Studio project and configuration
- changed : set the "FMOD" flag to TRUE for the (Windows) ReleaseOS build configuration
- changed : set the "UNATTENDED" flag to FALSE for all (Windows) *OS build configurations