Tweak PID & G26

Thanks to some great feedback from @RolandRosenfeld I did some small tweaks:

- Adjusted auto PID tune parameters
- Replaced manufacturer PID values
- Minor changes to the readme
- Raised retraction on G26 Mesh Test
- Merged latest bugfix from derhopp
- Added latest hex files

Co-Authored-By: Roland Rosenfeld <roland@spinnaker.de>

Marlin/AnycubicTFT.cpp

@@ -203,10 +203,10 @@ void AnycubicTFTClass::HandleSpecialMenu()
     SpecialMenu=true;
   } else if (strcmp(SelectedDirectory, "<auto tune hotend pid>")==0) {
     SERIAL_PROTOCOLLNPGM("Special Menu: Auto Tune Hotend PID");
-    enqueue_and_echo_commands_P(PSTR("M106 S178\nM303 E0 S240 C8 U1"));
+    enqueue_and_echo_commands_P(PSTR("M106 S178\nM303 E0 S210 C10 U1"));
   } else if (strcmp(SelectedDirectory, "<auto tune hotbed pid>")==0) {
     SERIAL_PROTOCOLLNPGM("Special Menu: Auto Tune Hotbed Pid");
-    enqueue_and_echo_commands_P(PSTR("M303 E-1 S80 C8 U1"));
+    enqueue_and_echo_commands_P(PSTR("M303 E-1 S60 C10 U1"));
   } else if (strcmp(SelectedDirectory, "<save eeprom>")==0) {
     SERIAL_PROTOCOLLNPGM("Special Menu: Save EEPROM");
     enqueue_and_echo_commands_P(PSTR("M500"));

Marlin/Configuration.h

@@ -380,9 +380,9 @@
   // If you are using a pre-configured hotend then you can use one of the value sets by uncommenting it
 
   // i3 Mega
-  #define  DEFAULT_Kp 16.43
-  #define  DEFAULT_Ki 1.03
-  #define  DEFAULT_Kd 55.79
+  #define  DEFAULT_Kp 15.94
+  #define  DEFAULT_Ki 1.17
+  #define  DEFAULT_Kd 54.19
 
   // Ultimaker
   //#define  DEFAULT_Kp 22.2

Marlin/G26_Mesh_Validation_Tool.cpp

@@ -44,7 +44,7 @@
   #endif
 
   #define EXTRUSION_MULTIPLIER 1.0
-  #define RETRACTION_MULTIPLIER 4
+  #define RETRACTION_MULTIPLIER 6
   #define PRIME_LENGTH 25.0
   #define OOZE_AMOUNT 2.25
 

Marlin/pins_TRIGORILLA_14.h

@@ -133,9 +133,9 @@
 		#define LCD_PINS_D7 29
 
 		#ifdef REPRAP_DISCOUNT_SMART_CONTROLLER
-			#define BEEPER_PIN 31
+			#define BEEPER_PIN 37
 
-			#define BTN_EN1 33
+			#define BTN_EN1 31
 			#define BTN_EN2 33
 			#define BTN_ENC 35