Reworked Plugin API and loading of plugins. This is an intermediate commit.


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@797 024a02f7-42f7-40fc-9f58-65666d1f2450
Fixed test and disabled singleton logic for now.


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@798 024a02f7-42f7-40fc-9f58-65666d1f2450