General cleanup, apply const

Marlin/Marlin_main.cpp

@@ -10509,13 +10509,13 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
                                     + (tmp_extruder == 0 ? -(PARKING_EXTRUDER_GRAB_DISTANCE) : PARKING_EXTRUDER_GRAB_DISTANCE);
               /**
                *  Steps:
-               *    1. raise Z-Axis to have enough clearance
-               *    2. move to park poition of old extruder
-               *    3. disengage magnetc field, wait for delay
-               *    4. move near new extruder
-               *    5. engage magnetic field for new extruder
-               *    6. move to parking incl. offset of new extruder
-               *    7. lower Z-Axis
+               *    1. Raise Z-Axis to give enough clearance
+               *    2. Move to park position of old extruder
+               *    3. Disengage magnetic field, wait for delay
+               *    4. Move near new extruder
+               *    5. Engage magnetic field for new extruder
+               *    6. Move to parking incl. offset of new extruder
+               *    7. Lower Z-Axis
                */
 
               // STEP 1
@@ -10797,7 +10797,7 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
  *   F[units/min] Set the movement feedrate
  *   S1           Don't move the tool in XY after change
  */
-inline void gcode_T(uint8_t tmp_extruder) {
+inline void gcode_T(const uint8_t tmp_extruder) {
 
   #if ENABLED(DEBUG_LEVELING_FEATURE)
     if (DEBUGGING(LEVELING)) {

Marlin/ultralcd_impl_HD44780.h

@@ -1145,9 +1145,9 @@ static void lcd_implementation_status_screen() {
       return ret_val;
     }
 
-    coordinate pixel_location(uint8_t x, uint8_t y) { return pixel_location((int16_t)x, (int16_t)y); }
+    inline coordinate pixel_location(const uint8_t x, const uint8_t y) { return pixel_location((int16_t)x, (int16_t)y); }
 
-    void lcd_implementation_ubl_plot(uint8_t x, uint8_t inverted_y) {
+    void lcd_implementation_ubl_plot(const uint8_t x, const uint8_t inverted_y) {
 
       #if LCD_WIDTH >= 20
         #define _LCD_W_POS 12