Add original anycubic stuff for tft serial handling including serial flush in case of error.

Marlin/src/lcd/anycubic_touchscreen.h

@@ -33,7 +33,7 @@ char *ftostr32(const float &);
 
 #define TFTBUFSIZE 4
 #define TFT_MAX_CMD_SIZE 96
-#define MSG_MY_VERSION "Knutwurst-1.0.5"
+#define MSG_MY_VERSION "Knutwurst-1.0.7"
 
 #define ANYCUBIC_TFT_STATE_IDLE 0
 #define ANYCUBIC_TFT_STATE_SDPRINT 1
@@ -119,6 +119,7 @@ private:
   char currentFileOrDirectory[30];
   uint8_t SpecialMenu = false;
   uint8_t FilamentSensorEnabled = true;
+  
 
 #if ENABLED(ANYCUBIC_FILAMENT_RUNOUT_SENSOR)
   char FilamentTestStatus = false;