Codetools: make TFindDeclarationTool.CheckDirectoryCache public. Needed for converter.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41426 4005530d-fff6-0310-9dd1-cebe43e6787f
Converter: fix a special case when a VCL unit is copied to project directory. Somehow LCL dependency was not added.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41427 4005530d-fff6-0310-9dd1-cebe43e6787f