Include information about packages used by a query to the workunit

The code generator should include information about all the repositories and versions used by a query.
Add application values with an application of "packages" with values of package1, package2, ...
e.g.

 <Application>
  <packages>
   <package0>ghalliday/gch-ecldemo-c#version2</package0>
   <package1>ghalliday/gch-ecldemo-d#version2</package1>
  </packages>
 </Application>