Generate world file for 2019 field

[matthew-reynolds]

🚀 Feature Request

Both for simulation and for #27, we need a map of the field. .world files are probably the way to go since that will let us run things in Gazebo, and they're pretty standard. It's also pretty likely that the WPILib will start distributing .world files again once their simulation capabilities are decent (They released files from 2014-2016, but not since then as far as I have found), so we'll be able to leverage that in the future.

For now, we need to create a .world file for the 2019 field. This does not need to be textured (for now), it just needs to get the geometry of the field in place. We should look at the 2014-2016 files from the WPILib as a starting point.

(If someone is looking to kill some time, we could also create 2017 and 2018 maps, that way we can create a full library of 2014-2019. Definitely not a priority though. Just a side project if someone is bored.)