Add range to anisotropic filter level (1 to 16 with integer steps)

drivers/gles3/rasterizer_gles3.cpp

@@ -412,7 +412,8 @@ void RasterizerGLES3::make_current() {
 void RasterizerGLES3::register_config() {
 
 	GLOBAL_DEF("rendering/quality/filters/use_nearest_mipmap_filter", false);
-	GLOBAL_DEF("rendering/quality/filters/anisotropic_filter_level", 4.0);
+	GLOBAL_DEF("rendering/quality/filters/anisotropic_filter_level", 4);
+	ProjectSettings::get_singleton()->set_custom_property_info("rendering/quality/filters/anisotropic_filter_level", PropertyInfo(Variant::INT, "rendering/quality/filters/anisotropic_filter_level", PROPERTY_HINT_RANGE, "1,16,1"));
 	GLOBAL_DEF("rendering/limits/time/time_rollover_secs", 3600);
 }