0.18.0

What's Changed

• Ensure that the Battle Theme loop occurs consistently by @colinkiama in #70
• Rewrite main menu to use the MenuSystem by @colinkiama in #71
• Create ship explosion sound effect by @colinkiama in #72
• Create player laser beam and enemy laser beam fire sound effects by @colinkiama in #73
• Create Low Health Warning sound effect by @colinkiama in #74
• 57 create game over stat reveal sound effect by @colinkiama in #75
• Add full screen toggle to main menu and pause menu by @colinkiama in #76

Full Changelog: 0.17.0...0.18.0