Reorganize includes and declarations

Marlin/src/lcd/HD44780/ultralcd_common_HD44780.h

   #endif
 #endif
 
-extern volatile uint8_t buttons;  //an extended version of the last checked buttons in a bit array.
-
 ////////////////////////////////////
 // Setup button and encode mappings for each panel (into 'buttons' variable
 //
 
 #if ENABLED(ULTIPANEL)
 
+  extern volatile uint8_t buttons;
+
   //
   // Setup other button mappings of each panel
   //

Marlin/src/lcd/menu/menu.cpp

 #if ENABLED(ULTIPANEL)
 
 #include "menu.h"
-
 #include "../ultralcd.h"
 #include "../../module/planner.h"
 #include "../../module/motion.h"
-#include "../../module/probe.h"
-#include "../../module/printcounter.h"
-#include "../../gcode/gcode.h"
 #include "../../gcode/queue.h"
-#include "../../module/configuration_store.h"
-#include "../../module/tool_change.h"
-#include "../../Marlin.h"
+#include "../../sd/cardreader.h"
 
-#include <stdarg.h>
+#if ENABLED(EEPROM_SETTINGS)
+  #include "../../module/configuration_store.h"
+#endif
+
+#if WATCH_HOTENDS || WATCH_THE_BED
+  #include "../../module/temperature.h"
+#endif
 
-#if ENABLED(SDSUPPORT)
-  #include "../../sd/cardreader.h"
+#if ENABLED(BABYSTEP_ZPROBE_OFFSET)
+  #include "../../module/probe.h"
+#endif
+
+#if ENABLED(ENABLE_LEVELING_FADE_HEIGHT) || ENABLED(AUTO_BED_LEVELING_UBL)
+  #include "../../feature/bedlevel/bedlevel.h"
 #endif
 
 ////////////////////////////////////////////
 ///////////// Global Variables /////////////
 ////////////////////////////////////////////
 
-// Buttons
-volatile uint8_t buttons;
-#if ENABLED(REPRAPWORLD_KEYPAD)
-  volatile uint8_t buttons_reprapworld_keypad;
-#endif
-
 // Menu Navigation
 int8_t encoderTopLine;
 typedef struct {
 screenFunc_t callbackFunc;
 bool liveEdit;
 
+// Prevent recursion into screen handlers
 bool no_reentry = false;
 
-// Initialized by settings.load()
-int16_t lcd_preheat_hotend_temp[2], lcd_preheat_bed_temp[2];
-uint8_t lcd_preheat_fan_speed[2];
-
 ////////////////////////////////////////////
 //////// Menu Navigation & History /////////
 ////////////////////////////////////////////
 }
 
 ////////////////////////////////////////////
-/////////////// Menu Actions ///////////////
+/////////// Common Menu Actions ////////////
 ////////////////////////////////////////////
 
 void _menu_action_back() { lcd_goto_previous_menu(); }
   else lcd_buzz(20, 440);
 }
 
-inline void line_to_current_z() {
-  planner.buffer_line(current_position, MMM_TO_MMS(manual_feedrate_mm_m[Z_AXIS]), active_extruder);
-}
+#if HAS_LINE_TO_Z
 
-void line_to_z(const float &z) {
-  current_position[Z_AXIS] = z;
-  line_to_current_z();
-}
+  void line_to_z(const float &z) {
+    current_position[Z_AXIS] = z;
+    planner.buffer_line(current_position, MMM_TO_MMS(manual_feedrate_mm_m[Z_AXIS]), active_extruder);
+  }
+
+#endif
 
 #if ENABLED(BABYSTEP_ZPROBE_OFFSET)
 

Marlin/src/lcd/menu/menu.h

 
 void lcd_move_z();
 void lcd_synchronize(PGM_P const msg=NULL);
-void line_to_z(const float &z);
 void _lcd_draw_homing();
 
 void watch_temp_callback_E0();
 void watch_temp_callback_E5();
 void watch_temp_callback_bed();
 
+#define HAS_LINE_TO_Z (ENABLED(DELTA) || ENABLED(PROBE_MANUALLY) || ENABLED(MESH_BED_LEVELING) || ENABLED(LEVEL_BED_CORNERS))
+
+#if HAS_LINE_TO_Z
+  void line_to_z(const float &z);
+#endif
+
 #if ENABLED(AUTO_BED_LEVELING_UBL) || ENABLED(PID_AUTOTUNE_MENU) || ENABLED(ADVANCED_PAUSE_FEATURE)
   void lcd_enqueue_command(const char * const cmd);
   void lcd_enqueue_commands_P(PGM_P const cmd);

Marlin/src/lcd/menu/menu_delta_calibrate.cpp

 
 #if ENABLED(DELTA_AUTO_CALIBRATION)
 
+  #include "../../gcode/gcode.h"
+
   float lcd_probe_pt(const float &rx, const float &ry) {
     _man_probe_pt(rx, ry);
     KEEPALIVE_STATE(PAUSED_FOR_USER);

Marlin/src/lcd/menu/menu_temperature.cpp

   #include "../../module/motion.h"
 #endif
 
+// Initialized by settings.load()
+int16_t lcd_preheat_hotend_temp[2], lcd_preheat_bed_temp[2];
+uint8_t lcd_preheat_fan_speed[2];
+
 //
 // "Temperature" submenu items
 //

Marlin/src/lcd/ultralcd.cpp

   #include "../libs/buzzer.h"
 #endif
 
+// Buttons
+volatile uint8_t buttons;
+
 #if ENABLED(SDSUPPORT) && PIN_EXISTS(SD_DETECT)
   uint8_t lcd_sd_status;
 #endif
 ///////////// Keypad Handling //////////////
 ////////////////////////////////////////////
 
+#if ENABLED(REPRAPWORLD_KEYPAD)
+  volatile uint8_t buttons_reprapworld_keypad;
+#endif
+
 #if ENABLED(ADC_KEYPAD)
 
   #define KEYPAD_HOME EN_REPRAPWORLD_KEYPAD_F1