Add a command to recursively list files in project

After creating a project, or adding a facet to an existing project, I often want to see all the files that are in the project. In bash, I typically use the find or tree command to recursively list the files in the project. A similar command would be useful in forge so I don't have to drop out of the forge shell.

The command should intelligently exclude temporary project files/directories by default. For instance, from the root of the project, the target directory would be included for Maven projects. A commandline flag can be provided to disable the filter.