Add game UI

[willwull]

We need a UI class that draws the player health in the upper left corner and the elapsed game time in the upper right corner. Is there anything else we need for the UI?

• [x] Player Health
• [x] Timer

[iRobsc]

Nothing else for the MVP except maybe a start screen?

[iRobsc]

And oh when u die u should be able to publish ur score to the website!

[willwull]

Yes, but I think those should be separate issues, like "Add start screen" and "Add game over screen". I was thinking gameplay UI specifically.

[xobust]

I'm thinking that the UI will be controlled from a class that similar to a controller has a reference back to game so that it can access the players health.

[willwull]

I'll get started on this.

[willwull]

Oh btw guys, should the game timer be its own class or should we just have it as a variable in GameManager? @iRobsc @xobust

[willwull]

Implemented with #78