add Alert and several things in animation

src/jsMain/kotlin/dev/inmo/jsuikit/modifiers/UIKitAlert.kt

@@ -0,0 +1,18 @@
+package dev.inmo.jsuikit.modifiers
+
+sealed class UIKitAlert(classname: String) : UIKitModifier {
+    override val classes: Array<String> = arrayOf(classname)
+
+    sealed class Style(classname: String) : UIKitAlert(classname) {
+
+        object Primary : Style("uk-alert-primary")
+        object Success : Style("uk-alert-success")
+        object Warning : Style("uk-alert-warning")
+        object Danger : Style("uk-alert-danger")
+
+    }
+
+    object Close : UIKitAlert("uk-alert-close")
+
+    companion object : UIKitAlert("uk-alert")
+}

src/jsMain/kotlin/dev/inmo/jsuikit/modifiers/UIKitAnimation.kt

@@ -60,4 +60,6 @@ sealed class UIKitAnimation (name: String) : UIKitModifier, AttributeValue(name)
 
     object Fast : UIKitAnimation("fast")
 
+    object KenBurns : UIKitAnimation("kenburns")
+
 }