Improve STM32F4 Flash Behavior (#17946)

Marlin/src/HAL/STM32/Servo.h

@@ -27,15 +27,27 @@
 #include "../../core/millis_t.h"
 
 // Inherit and expand on the official library
-class libServo : public Servo {
+class libServo {
   public:
     libServo();
-    int8_t attach(const int pin);
+    int8_t attach(const int pin = 0); // pin == 0 uses value from previous call
     int8_t attach(const int pin, const int min, const int max);
+    void detach() { stm32_servo.detach(); }
+    int read() { return stm32_servo.read(); }
     void move(const int value);
+
+    void pause();
+    void resume();
+
+    static void pause_all_servos();
+    static void resume_all_servos();
+
   private:
-    typedef Servo super;
+    Servo stm32_servo;
 
     int servo_pin = 0;
     millis_t delay = 0;
+
+    bool was_attached_before_pause;
+    int value_before_pause;
 };