cody: unit dependencies: colors

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40040 4005530d-fff6-0310-9dd1-cebe43e6787f
codetools: unitgraph: allow to extend uses and units

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40041 4005530d-fff6-0310-9dd1-cebe43e6787f