development: simplified MotionAnimation API

Sources/iOS/Material+CALayer.swift

@@ -282,7 +282,7 @@ extension CALayer {
         } else {
             let a = Motion.shadow(path: UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius).cgPath)
             a.fromValue = shadowPath
-            animate(animation: a)
+            animate(a)
         }
     }
 }

Sources/iOS/MotionTransition.swift

@@ -152,7 +152,7 @@ open class SlideMotionTransition: NSObject, UIViewControllerAnimatedTransitionin
                 if 0 < n.motionIdentifier.utf16.count {
                     for m in toView.subviews {
                         if n.motionIdentifier == m.motionIdentifier {
-                            m.motion(duration: duration, animations: m.motionAnimations)
+                            m.motion(m.motionAnimations)
                         }
                     }
                 }
@@ -168,7 +168,7 @@ open class SlideMotionTransition: NSObject, UIViewControllerAnimatedTransitionin
                 if 0 < n.motionIdentifier.utf16.count {
                     for m in toView.subviews {
                         if n.motionIdentifier == m.motionIdentifier {
-                            m.motion(duration: duration, animations: m.motionAnimations)
+                            m.motion(m.motionAnimations)
                         }
                     }
                 }

Sources/iOS/PulseMotion.swift

@@ -146,13 +146,13 @@ extension PulseMotion {
         
         switch animation {
         case .centerWithBacking, .backing, .pointWithBacking, .tap:
-            bLayer.motion(duration: duration, animations: .backgroundColor(color.withAlphaComponent(opacity / 2)))
+            bLayer.motion(.duration(duration), .backgroundColor(color.withAlphaComponent(opacity / 2)))
         default:break
         }
         
         switch animation {
         case .center, .centerWithBacking, .centerRadialBeyondBounds, .radialBeyondBounds, .point, .pointWithBacking:
-            pLayer.motion(duration: duration, animations: .scale(1))
+             pLayer.motion(.duration(duration), .scale(1))
         default:break
         }
         
@@ -182,13 +182,13 @@ extension PulseMotion {
             
             switch animation {
             case .centerWithBacking, .backing, .pointWithBacking, .tap:
-                bLayer.motion(duration: duration, animations: .backgroundColor(color.withAlphaComponent(0)))
+                bLayer.motion(.duration(duration), .backgroundColor(color.withAlphaComponent(0)))
             default:break
             }
             
             switch animation {
             case .center, .centerWithBacking, .centerRadialBeyondBounds, .radialBeyondBounds, .point, .pointWithBacking:
-                pLayer.motion(duration: duration, animations: .scale(.center == animation ? 1 : 1.325), .backgroundColor(color.withAlphaComponent(0)))
+                pLayer.motion(.duration(duration), .scale(.center == animation ? 1 : 1.325), .backgroundColor(color.withAlphaComponent(0)))
             default:break
             }