Added components to pass new lines of text from CmdProcess.java to CmdTab.java for display.

Also wired up TabbedCmdController.java to create new process and link to new tab.

TODO:
* Make tabs display text
* Make a button to create new tabs
* Make first (empty) tab useful
* Add text input box for typing commands
* Make tabs display text in different colors (red for stderr, black for stdout)
* Allow closing tabs