Menus and Restarts

Finally added the ability to restart the game, should your ship be destroyed, which also completes the base of the game loop, which at the moment is just - "Fight waves until you die". Not the end goal, but a start!

Also added the ability to pause by pressing the Escape key, or Start button on Controller

I have increased  the amount of power and health your starter ship has, as well as messed with some of the rates these things take to recharge. I've also removed hull repair as it was rather over-powered. In the future , I'll probably add repair stations to ports and space stations in the future.

Next on my to-do list:

* Add Radar
* Add more more patterns
* Add ports
* Add planets