Fix compile warnings, serial alias

Marlin/src/core/serial.h

 void serial_echopair_PGM(PGM_P const s_P, const char *v);
 void serial_echopair_PGM(PGM_P const s_P, char v);
 void serial_echopair_PGM(PGM_P const s_P, int v);
+void serial_echopair_PGM(PGM_P const s_P, unsigned int v);
 void serial_echopair_PGM(PGM_P const s_P, long v);
+void serial_echopair_PGM(PGM_P const s_P, unsigned long v);
 void serial_echopair_PGM(PGM_P const s_P, float v);
 void serial_echopair_PGM(PGM_P const s_P, double v);
-void serial_echopair_PGM(PGM_P const s_P, unsigned int v);
-void serial_echopair_PGM(PGM_P const s_P, unsigned long v);
 inline void serial_echopair_PGM(PGM_P const s_P, uint8_t v) { serial_echopair_PGM(s_P, (int)v); }
 inline void serial_echopair_PGM(PGM_P const s_P, bool v)    { serial_echopair_PGM(s_P, (int)v); }
-inline void serial_echopair_PGM(PGM_P const s_P, void *v)   { serial_echopair_PGM(s_P, (unsigned long)v); }
+inline void serial_echopair_PGM(PGM_P const s_P, void *v)   { serial_echopair_PGM(s_P, (uintptr_t)v); }
 
 void serialprintPGM(PGM_P str);
 void serial_echo_start();

Marlin/src/gcode/stats/M31.cpp

  * M31: Get the time since the start of SD Print (or last M109)
  */
 void GcodeSuite::M31() {
-  char buffer[21];
+  char buffer[22];
   duration_t(print_job_timer.duration()).toString(buffer);
 
   ui.set_status(buffer);

Marlin/src/lcd/dogm/status_screen_DOGM.cpp

             mixer.update_mix_from_vtool();
             mix_label = PSTR("Mx");
           }
+
+        #pragma GCC diagnostic push
+        #pragma GCC diagnostic ignored "-Wformat-overflow"
+
         sprintf_P(mixer_messages, PSTR(S_FMT " %d;%d%% "), mix_label, int(mixer.mix[0]), int(mixer.mix[1]));
         lcd_put_u8str(X_LABEL_POS, XYZ_BASELINE, mixer_messages);
 
+        #pragma GCC diagnostic pop
+
       #else
 
         if (show_e_total) {

Marlin/src/lcd/extui/lib/dgus/DGUSScreenHandler.cpp

   // It is using a hex display for that: It expects BSD coded data in the format xxyyzz
   void DGUSScreenHandler::DGUSLCD_SendPrintAccTimeToDisplay(DGUS_VP_Variable &var) {
     printStatistics state = print_job_timer.getStats();
-    char buf[21];
+    char buf[22];
     duration_t elapsed = state.printTime;
     elapsed.toString(buf);
     dgusdisplay.WriteVariable(VP_PrintAccTime, buf, var.size, true);
 
   void DGUSScreenHandler::DGUSLCD_SendPrintsTotalToDisplay(DGUS_VP_Variable &var) {
     printStatistics state = print_job_timer.getStats();
-    char buf[21];
+    char buf[10];
     sprintf_P(buf, PSTR("%u"), state.totalPrints);
     dgusdisplay.WriteVariable(VP_PrintsTotal, buf, var.size, true);
   }

Marlin/src/libs/duration_t.h

     return this->value;
   }
 
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wformat-overflow"
+
   /**
    * @brief Formats the duration as a string
    * @details String will be formated using a "full" representation of duration
         m = this->minute() % 60,
         s = this->second() % 60;
 
-    if (y) sprintf_P(buffer, PSTR("%iy %id %ih %im %is"), y, d, h, m, s);
+         if (y) sprintf_P(buffer, PSTR("%iy %id %ih %im %is"), y, d, h, m, s);
     else if (d) sprintf_P(buffer, PSTR("%id %ih %im %is"), d, h, m, s);
     else if (h) sprintf_P(buffer, PSTR("%ih %im %is"), h, m, s);
     else if (m) sprintf_P(buffer, PSTR("%im %is"), m, s);
       return 6;
     }
   }
+
+  #pragma GCC diagnostic pop
 };

Marlin/src/module/printcounter.cpp

 #endif
 
 void PrintCounter::showStats() {
-  char buffer[21];
+  char buffer[22];
 
   SERIAL_ECHOPGM(STR_STATS);
   SERIAL_ECHOLNPAIR(