codetools: findreferences: when on proc body search proc interface

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41133 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: sourceditor: connect scanner when setting codebuffer

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41134 4005530d-fff6-0310-9dd1-cebe43e6787f