Removed unused UI files (#841)

Various files remained from the UI development process that were unused
and deprecated. This removes those files, while also fixing a
CreateAssetMenu name from WorldUI to BasisUI.

Author: dooly123

Basis/Packages/com.basis.framework/BasisUI/Elements/.Deprecated/PanelLayoutContainer.cs

@@ -132,7 +132,7 @@ public enum StyleComponentType
         Dropdown,
     }
 
-    [CreateAssetMenu(fileName = "Style Library", menuName = "WorldUI/Style Library")]
+    [CreateAssetMenu(fileName = "Style Library", menuName = "BasisUI/Style Library")]
     public class UiStyleLibrary : ScriptableObject
     {
         [Header("Base Styles")]

Basis/Packages/com.basis.framework/BasisUI/Elements/.Deprecated/PanelLayoutContainer.cs.meta

@@ -24,7 +24,7 @@ public enum UiPaletteStyle
         Scrollbar,
     }
 
-    [CreateAssetMenu(fileName = "Style Palette", menuName = "WorldUI/Style Palette")]
+    [CreateAssetMenu(fileName = "Style Palette", menuName = "BasisUI/Style Palette")]
     public class UiStylePalette : ScriptableObject
     {