IDE: package editor: clear dependency

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45450 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: package editor: update dependencyappy button

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45451 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: package editor: clean up

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45452 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: package editor: allow multi select, issue 26289

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45453 4005530d-fff6-0310-9dd1-cebe43e6787f