Ged rid of manipulation_msgs and household_objects_database_msgs dependency

[JenniferBuehler]

The ROS interface can now use moveit_msgs messages as they contain all information required now.

[ksjordan]

If I have moveit_msgs does that mean I can remove references to these dependencies on CMakeLists in graspit-pkgs?

[JenniferBuehler]

Yes, though you will probably have to change the include directives and namespace directives in the code as well. The compiler will guide you through it ;) I've been wanting to do it for a while but don't get around to it. If you end up doing it, I'll be happy about a PR :))

[JenniferBuehler]

This was already half done (currently still in branch melodic-support), but before completing and closing this properly, issues #40 and #41 need to be resolved.