Added good and bad robots assets

[casals]

Contains

• Assets for Good Robot and Bad Robot, created by @Quaternius

Objective

Include new assets creating during GSoC 2019

Changes

• Added new prefabs: robot_good_animated and robot_bad_animated
• Added correspondent textures and materials

Usage

In the console (F1), type spawnPrefab followed by one of the new prefabs:

• spawnPrefab robot_good_animated
• spawnPrefab robot_bad_animated

[mayant15]

I had a problem with the bad robot. Is this a known issue? The good robot works great though! 👍

[casals]

Yes - it's a known issue. We discussed this in Discord a while ago but I forgot to actually open the issue, sorry. @Cervator should we merge + open issue or just block the PR for now?

[AndyTechGuy]

Just tested this now! I personally think it's important to fix the animation problem before this PR is merged

[skaldarnar]

Closing it so we can add the new animation format after MovingBlocks/Terasology#3785 is merged.