feat: Refactor project structure and add core library

- Migrate shared components from WPF to a new Core library.
- Introduce GroupInfo, M3UInfo, and ObservableViewModelBase classes.
- Implement M3UParser for downloading and parsing M3U files.
- Add ProgramsData for managing program lists and guides.
- Create SettingsModel for application settings management.
- Update project references in solution files.

TV Player Core/M3UInfo.cs

@@ -0,0 +1,14 @@
+namespace TV_Player
+{
+    public class M3UInfo
+    {
+        public string CUID { get; set; }
+        public string Number { get; set; }
+        public string TvgID { get; set; }
+        public string TvgName { get; set; }
+        public string GroupTitle { get; set; }
+        public string Logo { get; set; }
+        public string Name{ get; set; }
+        public string Url { get; set; }
+    }
+}