ProjectGuid fix
Move some LINQ helpers from CodeGenerator intoSugar
List<T> should be  sequence on all platforms
Workaround for [70126: Can't mix negative values and Uint in "if" expression, even if target is signed]
Made PreBuild event conditional to only run on Windows
ISequence<T>.Contains<T> fixes for Echoes
Merge remote-tracking branch 'origin/develop' into stable-feature-json