Rename ultralcd implementation files for consistency

Marlin/fonts/README.md

@@ -17,7 +17,7 @@ For the second half of the font we now support up to 11x11 pixel.
 - Export as a `*.bdf` file
 - Use `bdf2u8g.exe` to produce the `.h` file. Examples for the existing fonts are in `make_fonts.bat`.
 - Edit the produced `.h` file to match our needs. Find hints in the `dogm_font_data_.h` files.
-- Make a new entry in the font list in `dogm_lcd_implementation.h` before the `#else // fall-back` line:
+- Make a new entry in the font list in `ultralcd_impl_DOGM.h` before the `#else // fall-back` line:
 ```cpp
     #elif ENABLED(DISPLAY_CHARSET_NEWNAME)
       #include "dogm_font_data_yourfont.h"

Marlin/ultralcd.cpp

@@ -44,9 +44,9 @@ uint8_t lcd_status_message_level;
 char lcd_status_message[3 * (LCD_WIDTH) + 1] = WELCOME_MSG; // worst case is kana with up to 3*LCD_WIDTH+1
 
 #if ENABLED(DOGLCD)
-  #include "dogm_lcd_implementation.h"
+  #include "ultralcd_impl_DOGM.h"
 #else
-  #include "ultralcd_implementation_hitachi_HD44780.h"
+  #include "ultralcd_impl_HD44780.h"
 #endif
 
 // The main status screen

Marlin/ultralcd_impl_DOGM.h

@@ -21,7 +21,7 @@
  */
 
 /**
- * dogm_lcd_implementation.h
+ * ultralcd_impl_DOGM.h
  *
  * Graphics LCD implementation for 128x64 pixel LCDs by STB for ErikZalm/Marlin
  * Demonstrator: http://www.reprap.org/wiki/STB_Electronics