Add build constant SignAssembly
Add build constant SignAssembly

SonarSource-VisualStudio/sonar-msbuild-runner,SonarSource-VisualStudio/sonar-scanner-msbuild,SonarSource-DotNet/sonar-msbuild-runner,SonarSource-VisualStudio/sonar-msbuild-runner,SonarSource/sonar-msbuild-runner,duncanpMS/sonar-msbuild-runner,duncanpMS/sonar-msbuild-runner,SonarSource-VisualStudio/sonar-scanner-msbuild,duncanpMS/sonar-msbuild-runner,SonarSource-VisualStudio/sonar-scanner-msbuild