Add contents scale change event (handles NPNVcontentsScaleFactor).
Created additional cmake variable set based upon status of FB_ATLREG_MACHINEWIDE which properly sets the package install scope of the plugin projects main wxs file

Conflicts:
	fbgen/src/Win/WiX/TemplateInstaller.wxs
Remove browser detection which broke on IE11
fix weak_ptr checking in JSObject, wrap InvokeAsync usage in catch
Merge pull request #125 from dougma/FB-253

fix weak_ptr checking in JSObject, wrap InvokeAsync usage in catch
Merge pull request #124 from dougma/FB-252

Remove browser detection which broke on IE11
Merge pull request #119 from gm281/contents-scale-factor-handling

Add contents scale change event (handles NPNVcontentsScaleFactor).
Fix for a crash during shutdown