Asteroids in Bevy

todo

implement https://paste.rs/7i9Ra.rs
Review PR
Shooting an asteroid turns it into 2 smaller asteroids
When asteroids spawn, they don't immediately kill the ship
When something dies, it explodes
Remove the explosions so we don't fill up memory if we play a long time
screens
- start
- get ready
- playing
- game over
- boss (when the boss walks in and we have to hide)
score
- track score in a resource
- display score on screen
- track high score in resource
- display high score
- save high score on game over
- load high score on startup
- update game over screen with correct score
- get ready should show correct high score
- when restarting game score should reset
After destroying all asteroids, level increases
- detect all asteroids are gone
- increase the number of asteroids
- switch to get ready state
teleport ship
rewrite collision system to use Rasmusgo's style
ufo
- spawn ufo x seconds into a level
- ufo moves randomly
- ufo fires bullets towards the current location of player
- ufo bullets can kill player
- ufo bullets can kill asteroids
- ship bullets can kill ufo
sounds
- firing bullet
- explosion
- ufo
- thrusting

AI

set speed of game to really fast
- toggle speed on number key input
- set speed
- display speed
toggle bot mode
ai
- loop
  - create population
  - for each individual
    - start a new game
    - play until it dies
  - next gen the bots
  - save the weights at the end of every gen
  - load weights from file
All sounds created by chiptone.