Multiple project fixes

* Change 'EnableEnhancedInstructionSet' from 'StreamingSIMDExtensions' to 'NotSet' in common.props
* Enable Whole Program Optimization (LTCG) for Release configurations all projects
* Add "Release Unicode" & "Debug Unicode" as 'Or' conditions to common.props
* Change "Release_Unicode"/"Debug_Unicode" to "Release Unicode"/"Debug Unicode"
* Rename forgotten "Release Unicode|x64" configuration to "Release|x64" in libssf
* Set /Ob1 and /Os for libssf