rtttl player (#1171)

* rtttl player

* fixes

* Cleanup, add action, condition, etc.

* add test

* updates

* fixes

* Add better error messages

* lint

esphome/components/output/float_output.h

@@ -46,9 +46,20 @@ class FloatOutput : public BinaryOutput {
    */
   void set_min_power(float min_power);
 
-  /// Set the level of this float output, this is called from the front-end.
+  /** Set the level of this float output, this is called from the front-end.
+   *
+   * @param state The new state.
+   */
   void set_level(float state);
 
+  /** Set the frequency of the output for PWM outputs.
+   *
+   * Implemented only by components which can set the output PWM frequency.
+   *
+   * @param frequence The new frequency.
+   */
+  virtual void update_frequency(float frequency) {}
+
   // ========== INTERNAL METHODS ==========
   // (In most use cases you won't need these)