Latest working version of 3D imagery overlay. Unresolved errors with Google URLs for satellite imagery.

Added command to select target position for robot - command can be accessed via a right-click in the 3D View perspective --Lionel

I added the ability for the parser to pack an array of any mavlink standard type.  This will allow array types to be specified for mavlink messages without using the type="array" syntax.

I also changed how a bunch of the strings were constructed to more closely conform to the coding style guidelines by reducing the number of implicit copy constructor calls