Improved support for panelolu2 encoder and buzzer

I added #define for LCD_FEEDBACK_FREQUENCY_HZ and
LCD_FEEDBACK_FREQUENCY_DURATION_MS  which is used to alter the default
buzzer sound.

When selecting Panelolu2 in configuration.h:
- it automatically sets the correct ENCODER_PULSES_PER_STEP and
ENCODER_STEPS_PER_MENU_ITEM.
- if LCD_USE_I2C_BUZZER is defined it will also set the default
LCD_FEEDBACK_FREQUENCY_HZ and LCD_FEEDBACK_FREQUENCY_DURATION_MS

When selecting the sanguinololu 1284p the following is true:
- its now enables  LARGE_FLASH
- It enables the gcode M300 when the panelolu2 LCD_USE_I2C_BUZZER is
defined

Marlin/ultralcd_implementation_hitachi_HD44780.h

@@ -711,7 +711,11 @@ static void lcd_implementation_drawmenu_sddirectory(uint8_t row, const char* pst
 static void lcd_implementation_quick_feedback()
 {
 #ifdef LCD_USE_I2C_BUZZER
-    lcd.buzz(60,1000/6);
+	#if !defined(LCD_FEEDBACK_FREQUENCY_HZ) || !defined(LCD_FEEDBACK_FREQUENCY_DURATION_MS)
+	  lcd_buzz(1000/6,100);
+	#else
+	  lcd_buzz(LCD_FEEDBACK_FREQUENCY_DURATION_MS,LCD_FEEDBACK_FREQUENCY_HZ);
+	#endif
 #elif defined(BEEPER) && BEEPER > -1
     SET_OUTPUT(BEEPER);
     for(int8_t i=0;i<10;i++)