refactored some code + bug fixes

Author: erikmartin29

WWDC 2018 Debug Xcode Project/.DS_Store

@@ -0,0 +1,24 @@
+import Foundation
+import SpriteKit
+
+//delays animations
+public func delay(_ delay:Double, closure:@escaping ()->()) {
+    let when = DispatchTime.now() + delay
+    DispatchQueue.main.asyncAfter(deadline: when, execute: closure)
+}
+
+//bitmask declarations
+struct PhysicsCategory {
+    static let None      : UInt32 = 0
+    static let Bullet    : UInt32 = 0b1       // 1
+    static let Ship      : UInt32 = 0b10      // 2
+    static let Note      : UInt32 = 0b100     // 3
+}
+
+struct NoteLength  {
+    static let quarter   : Double = 0.25
+    static let half      : Double = 0.25
+    //add more later?
+}
+
+