title: Install4j - Action "Delete files and directories" appends installation directory in front of array values
body: <p>I'm writing a project in Install4j that required some special code in the uninstaller to allow partial uninstallation.</p>
  
  <p>I have a <code>Delete files and directories</code> action in the uninstallation section with a boolean acting as a flag to fire it or the typical full uninstall action. All of this appears to be working fine.</p>
  
  <p>The issue I am having is the variable I pass to the delete files and directories action (${installer:uninstallDirs}). I have attempted setting this variable to a String Array, or an undefined variable type. With either of those settings, I have attempted to pass it full string paths to the directories, file objects, and relative string paths. </p>
  
  <p>During the action execution, the debug output will show the following.</p>
  
  <pre><code>[INFO] com.install4j.runtime.beans.screens.UninstallationScreen [ID 27]: Show screen [INFO]
  com.install4j.runtime.beans.actions.files.DeleteFileAction [ID 1495]:
  Execute action
         Property directoryFilter: null
         Property fileFilter: null
         Property files: [[suppressed]]
         Property filesRoot: null
         Property backupForRollback: true
         Property recursive: true
         Property rollbackSupported: true
         Property showFileNames: true
         Property showProgress: false
         The file "C:\InstallDir\[C:\InstallDir\Server, C:\InstallDir\Client, C:\InstallDir\Network]" does not exist
         Execute action successful after 14 ms
  </code></pre>
  
  <p>So it appears to be failing because it will put the Install Directory into the value prior to the array, despite the object being passed being an array. I have output the value of the array at a previous section and can confirm that the array is being built correctly.</p>
  
  <p>I suspect this has something to do with the "Make all paths relative when saving the project file" setting, but I don't want to just start changing project settings until it works.</p>
  
  <p>Any suggestions or tests I might try to perform would be greatly appreciated.</p>
  
  <p><img src="https://i.stack.imgur.com/X0tIi.png" alt="See a screenshot of the action setup here"></p>