To package one of these scripts:
1.  open it in Script Editor
2.  Save As, using File Format: Application, with Startup Screen checked
3.  Copy and paste the appropriate description below into the "Description" 
    pane in Script Editor
4.  Save
5.  Package & distribute the resulting app bundle


Descriptions:

This script will disable the Quick Look plugin shipped with XCode by renaming it, adding a ".disabled" suffix.

This script will restore the Quick Look plugin shipped with XCode, undoing the effects of the "Disable XCode QL Plugin" application.