video_core: add texture filtering (#5017)

video_core: add texture filtering

src/core/settings.h

@@ -147,6 +147,8 @@ struct Values {
     u16 resolution_factor;
     bool use_frame_limit;
     u16 frame_limit;
+    u16 texture_filter_factor;
+    std::string texture_filter_name;
 
     LayoutOption layout_option;
     bool swap_screen;