Fixed Shadow Issues (#440)

* Fixed Shadow Issues

Shadows were being cutoff by the snapshots, and then were applied again to the snapshot. This fix first removes the shadows, takes the snapshot, and then adds the shadows to the snapshot much like the cornerRadius.

* added shadow opacity

* Revert "added shadow opacity"

This reverts commit d9f0020.

* Added/Fixed Shadow Opacity

This reverts commit 590a9f9.

Sources/HeroContext.swift

@@ -138,11 +138,19 @@ extension HeroContext {
 
     unhide(view: view)
 
-    // capture a snapshot without alpha & cornerRadius
+    // capture a snapshot without alpha, cornerRadius, or shadows
     let oldCornerRadius = view.layer.cornerRadius
     let oldAlpha = view.alpha
+		let oldShadowRadius = view.layer.shadowRadius
+		let oldShadowOffset = view.layer.shadowOffset
+		let oldShadowPath = view.layer.shadowPath
+		let oldShadowOpacity = view.layer.shadowOpacity
     view.layer.cornerRadius = 0
     view.alpha = 1
+		view.layer.shadowRadius = 0.0
+		view.layer.shadowOffset = .zero
+		view.layer.shadowPath = nil
+		view.layer.shadowOpacity = 0.0
 
     let snapshot: UIView
     let snapshotType: HeroSnapshotType = self[view]?.snapshotType ?? .optimized
@@ -210,6 +218,10 @@ extension HeroContext {
 
     view.layer.cornerRadius = oldCornerRadius
     view.alpha = oldAlpha
+		view.layer.shadowRadius = oldShadowRadius
+		view.layer.shadowOffset = oldShadowOffset
+		view.layer.shadowPath = oldShadowPath
+		view.layer.shadowOpacity = oldShadowOpacity
 
     snapshot.layer.anchorPoint = view.layer.anchorPoint
     snapshot.layer.position = containerView.convert(view.layer.position, from: view.superview!)