Encapsulate common display code in a singleton (#12395)

* Encapsulate common LCD code in a singleton
* Depend more UBL code on UBL_DEVEL_DEBUGGING
  - Since most users don't need the debugging on at all times, this helps reduce the default build size for UBL by over 2K, a little closer to fitting on 128K boards.

Marlin/src/gcode/calibrate/G28.cpp

@@ -425,7 +425,7 @@ void GcodeSuite::G28(const bool always_home_all) {
     tool_change(old_tool_index, 0, NO_FETCH);
   #endif
 
-  lcd_refresh();
+  ui.refresh();
 
   report_current_position();
   #if ENABLED(NANODLP_Z_SYNC)