Move number-to-string function to utility.*

Marlin/utility.h

@@ -25,4 +25,50 @@
 
 void safe_delay(millis_t ms);
 
-#endif
+#if ENABLED(ULTRA_LCD)
+
+  // Convert unsigned int to string with 12 format
+  char* itostr2(const uint8_t& x);
+
+  // Convert signed int to rj string with 123 or -12 format
+  char* itostr3(const int& x);
+
+  // Convert unsigned int to lj string with 123 format
+  char* itostr3left(const int& xx);
+
+  // Convert signed int to rj string with _123, -123, _-12, or __-1 format
+  char *itostr4sign(const int& x);
+
+  // Convert unsigned float to string with 1.23 format
+  char* ftostr12ns(const float& x);
+
+  // Convert signed float to fixed-length string with 023.45 / -23.45 format
+  char *ftostr32(const float& x);
+
+  // Convert float to fixed-length string with +123.4 / -123.4 format
+  char* ftostr41sign(const float& x);
+
+  // Convert signed float to string (6 digit) with -1.234 / _0.000 / +1.234 format
+  char* ftostr43sign(const float& x, char plus=' ');
+
+  // Convert unsigned float to rj string with 12345 format
+  char* ftostr5rj(const float& x);
+
+  // Convert signed float to string with +1234.5 format
+  char* ftostr51sign(const float& x);
+
+  // Convert signed float to space-padded string with -_23.4_ format
+  char* ftostr52sp(const float& x);
+
+  // Convert signed float to string with +123.45 format
+  char* ftostr52sign(const float& x);
+
+  // Convert float to rj string with 123 or -12 format
+  FORCE_INLINE char *ftostr3(const float& x) { return itostr3((int)x); }
+
+  // Convert float to rj string with _123, -123, _-12, or __-1 format
+  FORCE_INLINE char *ftostr4sign(const float& x) { return itostr4sign((int)x); }
+
+#endif // ULTRA_LCD
+
+#endif // __UTILITY_H__