Delete or restore draw command in world RPC responder plugin

[PeterBowman]

#27 (comment)

• I added a new info command to know the robots information (robot and manipulators names) and the list of all the bodies in the environment (including the robots)
• Now world grab (manipulator) (obj) (num) 0/1 command is working fine
• Now world whereis tcp (manipulator) command is working fine
• it has been deleted world mk mesh and world draw 0/1 (radius r g b) commands because I think (maybe) are useless, at least with teoSim.

#27 (comment)

• Recovered world mk mesh and world draw 0/1 (radius r g b) at the request of @jgvictores. The firts will make a default mesh (always the same... probably it hasn't been finished the developer intention because you can't enter aditional params). The second I don't know what it can be used for.
• world whereis obj (name) command it's working fine. It's just only that this command returns the object position respect to the first position that you make the object. Always that you create an object, the position returned will be (0.0 0.0 0.0) but, if you move the object, this command will return the new position. So, you can make the object always in zero position and then, move the object with world mv (name) (three params for pos) to the new position.
• formatted code to make it easier to understand

Draw methods are noop at OpenraveYarpWorldRpcResponder since #31, but we might want to use them in the robotDraw example app. Either restore them, or remove entirely.

[PeterBowman]

Old sources: https://github.com/roboticslab-uc3m/asibot-main/tree/0c835922307b52a1a762da947021c9879aa282ba/src/libraries/RlPlugins/ravebot.