Added a 3d-printer skin upgrade for robots #3694
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This PR adds a new upgrade for robots: The skin upgrade.

This upgrade allows for adding 3d-printed blocks as a skin to robots. They will be rendered at the location of the robot.
In addition 3d-printed blocks can be set as the "arms" of a robot. This is purely decorational, but allows for some cool applications, like building a working GLaDOS from portal (an example can be found below).