SONARPLUGINS-3807 pom.xml: Fix documentation URL
SONARPLUGINS-3709 Declare a dependency on the C# plugin
SONARPLUGINS-3680 Improve the error message when MsBuild.exe or StyleCop.dll are not found
SONARPLUGINS-3646 Link to the Visual Studio Bootstrapper if the "sonar.stylecop.projectFilePath" property is not set
Improve tests
SONARPLUGINS-3697 Support custom StyleCop rules
Fix some quality flaws