Y axis movement

[ThomasDavisA]

I did a bit more when I probably should have separated this out, so apologies to this.

Kobold sprites and their names are contained in a Kobold Plate now. This allows me to keep the names under kobolds as they move about on screen. Y axis movement has been implemented, as well as the kobolds spawning in random locations.

Kobolds have been split into their own file as well.

[mdavisprog]

Tried to test this locally and ran into some issues.

1. There is an error trying to call the 'update' function on a kobold's chat bubble on line 122 in kobold.js. This is due to the test kobolds that are added without creating a chat bubble for them. I don't know if this is something I missed or was missed with the rebase, but if you could add the following after line 76 in pixi-renderer.js, that would fix the issue.

   koboldList.forEach(data => {
       const newUser = addNewKobold(data, Y_AXIS_LOWER_BOUND, Y_AXIS_UPPER_BOUND, X_AXIS_LOWER_BOUND, X_AXIS_UPPER_BOUND);
       app.stage.addChild(newUser.koboldPlate);
       newUser.chatBubble = new ChatBubble(app.stage);
   })

2. New kobolds that are added from the fetcher are spawned in the upper left corner of the browser and never move out of that position. I think this is because no bounds are passed in when calling 'addNewKobold'. This should be fixed before merging over.

Other than the two issues mentioned above, everything else looks good.

[mdavisprog]

Closing due to newer pull request merge.