project: Update for recent upstream merge. 

project: Update for recent upstream merge. 

project: Update for recent upstream merge. 

project: Correctly replace all mention of YASM in readme. 

project: Update for recent upstream merge. 

project: Update AppVeyor to use nuget gitlink. 

project: Update for recent upstream merge. 

project: Update appveyor to build using latest available windows sdk. 

project: Update for recent upstream merge. 

project: Convert to using custom yasm build customization.