Add XWT to built-in references
Fix formatting policy
Make MSBuild targets non-language-specific
Use resolved addin version in dependency attributes
Add more core references to addin build
If addin ref specifies version, check it's satisfied
Clean up the targets a little
Bump NuGet package version
Switch addin projects to use xbuild engine
Fix msbuild failure generating targets file
Fix build dependencies for generated dependency attributes
Bump nuget package to 0.1.4
Display referenced addins in solution tree
Convenience script for publishing nuget packages
Stronger typing on events