Package editor: update only TreeNode's image after changing file's HasRegisterProc property. Part of issue #26188

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45737 4005530d-fff6-0310-9dd1-cebe43e6787f
Package editor: formatting

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45738 4005530d-fff6-0310-9dd1-cebe43e6787f
Package editor: don't update the whole tree after changing file's AddToUses property. Part of issue #26188

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45739 4005530d-fff6-0310-9dd1-cebe43e6787f