Bugfix/tableview insetgrouped (#494)

* Fixed TableView skeleton cannot hide if style is insetGrouped

* Fixed show skeleton button not visible

* Update the fix base on PR comments

Examples/iOS Example/Sources/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -2,13 +2,8 @@
   "colors" : [
     {
       "color" : {
-        "color-space" : "srgb",
-        "components" : {
-          "alpha" : "1.000",
-          "blue" : "1.000",
-          "green" : "1.000",
-          "red" : "1.000"
-        }
+        "platform" : "universal",
+        "reference" : "systemBlueColor"
       },
       "idiom" : "universal"
     },

SkeletonViewCore/Sources/Internal/SkeletonExtensions/SubviewsSkeletonables.swift

@@ -21,7 +21,18 @@ extension UITableView {
 		// Some developer trying to call `view.showAnimatedSkeleton()`
 		// when the request or data is loading which sometimes happens before the ViewDidAppear
 		guard window != nil else { return [] }
-        return subviews
+        
+        var result = [UIView]()
+
+        for subview in subviews {
+            if String(describing: type(of: subview)) == "UITableViewWrapperView" {
+                result.append(contentsOf: subview.subviews)
+            } else {
+                result.append(subview)
+            }
+        }
+        
+        return result
     }
     
 }