Replaced screen inheritance from my models to propertychangedbase

Author: Abdesol

CutCode/Models/CodeBoxModel.cs

@@ -10,7 +10,7 @@
 
 namespace CutCode
 {
-    public class CodeBoxModel : Screen
+    public class CodeBoxModel : PropertyChangedBase
     {
         public int id { get; set; }
         private string _title;

CutCode/Models/SideBarBtnModel.cs

@@ -15,7 +15,7 @@ public static class SideBarBtns
         public static List<string> SideBarBtnsLightTheme = new List<string>() { "home_black.png", "add_black.png", "fav_black.png", "settings_black.png" };
 
     }
-    public class SideBarBtnModel : Screen
+    public class SideBarBtnModel : PropertyChangedBase
     {
         private readonly IThemeService themeService;
         private List<string> btnBothimages = new List<string>();

CutCode/Models/ThemeButtonModel.cs

@@ -8,7 +8,7 @@
 
 namespace CutCode
 {
-    public class ThemeButtonModel : Screen
+    public class ThemeButtonModel : PropertyChangedBase
     {
         private readonly IThemeService themeService;
         public ThemeButtonModel(string _text, IThemeService _themeService)