Use the latest verison of C# Squid Plugin (improvements on the C# parser)

Include C# Squid Plugin 1.1 in the distribution. This new version brings lots of improvements:

• far better performances for the parser
• support for //NOSONAR tag
• possibility to configure the quality profile so that parsing failures are reported as violations
• commented out code is now reported as a violation
• copy-paste detection ignores namespace 'using' statements
• Lots of bug fixes

See the changelog of this version for a more detailed list.