replaced postbuild commands by build.targets for server plugins (issue #4368)
replaced postbuild commands by build.targets for client plugins (issue #4368)
replaced postbuild commands by build.targets for unused plugins (issue #4368)
replaced pre- and postbuild commands by build.targets for MP2-Setup.wixproj (issue #4368)
removed comments about targets from *.csproj-files without post build commands (issue #4368)