Add laser engraving feature for Anycubic Mega Pro

- Enable integrated laser engraving in Configuration.h
- Update laser feature parameters in Configuration_adv.h
- Modify Version.h to reflect version 1.5.6 and new distribution date
- Implement laser initialization and command handling in anycubic_touchscreen.cpp
- Add support for BMP file handling in cardreader.cpp
- Define laser parameters and structures in anycubic_touchscreen.h

Author: knutwurst

Marlin/Configuration.h

@@ -63,14 +63,14 @@
 #endif
 
 /*
- * This enables the integrated Laser engaving feature
+ * This enables the integrated Laser engraving feature
  * in the anycubic touchscreen. It's currently only
- * supported by the Anycubic MEGA Pro and therefore it
- * is automatically set if the MEGA_P is enabled.
+ * supported by the Anycubic MEGA Pro.
  *
+ * Uncomment the following line to enable laser support:
  */
 #if ENABLED(KNUTWURST_MEGA_P)
-// #define KNUTWURST_MEGA_P_LASER
+  #define KNUTWURST_MEGA_P_LASER
 #endif
 
 /*

Marlin/Configuration_adv.h

@@ -3437,11 +3437,17 @@
  */
 // #define SPINDLE_FEATURE
 
-#if ENABLED(KNUTWURST_MEGA_P)
+#if ENABLED(KNUTWURST_MEGA_P_LASER)
   #define LASER_FEATURE
 
   #define SPINDLE_LASER_ENA_PIN 40  // D40 should be unused. The laser is only connected to the PWM output.
   #define SPINDLE_LASER_PWM_PIN HEATER_0_PIN
+
+  // Anycubic TFT laser feature.
+  #define MAX_X_SIZE     220
+  #define MAX_Y_SIZE     150
+  #define LASER_X_OFFSET   0  // The distance in the X direction between the laser and the extruder.
+  #define LASER_Y_OFFSET  65  // The distance in the Y direction between the laser and the extruder.
 #endif
 
 #if EITHER(SPINDLE_FEATURE, LASER_FEATURE)

Marlin/src/inc/Version.h

@@ -41,10 +41,10 @@
  * here we define this default string as the date where the latest release
  * version was tagged.
  */
-#define CUSTOM_BUILD_VERSION "1.5.5"
+#define CUSTOM_BUILD_VERSION "1.5.6"
 
 #ifndef STRING_DISTRIBUTION_DATE
-  #define STRING_DISTRIBUTION_DATE "2026-01-24"
+  #define STRING_DISTRIBUTION_DATE "2026-02-01"
 #endif
 
 /**