added given SpaceWar files
implemented rotation of the spaceships
implemented spaceship movement
added spawning of bullets
fixed radians bug
added bullet movement
remove bullets after leaving the screen
handle bullet collisions
improved collisions
implemente spaceship lifes
fixed typo
added custom shape to spaceship
improved bullet speed & spaceship controls
added custom shape to bullets
display lifes
Merge branch 'feature/worksheet2' into develop
cleanup & improved indentation
prevent spaceships to fly off the map
improved bullets
Merge branch 'release/worksheet2'