Adding support for the Tronxy and Zonestar LCD

Code borrowed and modified from erikkallen/Marlin_tronxy.
Changed the ANET_KEYPAD_LCD to zonestar, since it is the same device.
I kept a define for ANET_KEYPAD_LCD to enable ZONESTAR_LCD.

Marlin/Conditionals_LCD.h

 
     #define U8GLIB_ST7565_64128N
 
-  #elif ENABLED(ANET_KEYPAD_LCD)
+  #elif ENABLED(ZONESTAR_LCD)
 
     #define REPRAPWORLD_KEYPAD
     #define REPRAPWORLD_KEYPAD_MOVE_STEP 10.0

Marlin/Configuration.h

 //#define CARTESIO_UI
 
 //
-// ANET_10 Controller supported displays.
+// ANET and Tronxy Controller supported displays.
 //
-//#define ANET_KEYPAD_LCD         // Requires ADC_KEYPAD_PIN to be assigned to an analog pin.
+//#define ZONESTAR_LCD            // Requires ADC_KEYPAD_PIN to be assigned to an analog pin.
                                   // This LCD is known to be susceptible to electrical interference
                                   // which scrambles the display.  Pressing any button clears it up.
+                                  // This is a LCD2004 display with 5 analog buttons.
+
 //#define ANET_FULL_GRAPHICS_LCD  // Anet 128x64 full graphics lcd with rotary encoder as used on Anet A6
                                   // A clone of the RepRapDiscount full graphics display but with
                                   // different pins/wiring (see pins_ANET_10.h).

Marlin/SanityCheck.h

   #endif
   #if ENABLED(REPRAPWORLD_KEYPAD) \
       && DISABLED(CARTESIO_UI) \
-      && DISABLED(ANET_KEYPAD_LCD)
+      && DISABLED(ZONESTAR_LCD)
     + 1
   #endif
   #if ENABLED(RIGIDBOT_PANEL)
   #if ENABLED(OLED_PANEL_TINYBOY2)
     + 1
   #endif
-  #if ENABLED(ANET_KEYPAD_LCD)
+  #if ENABLED(ZONESTAR_LCD)
     + 1
   #endif
   , "Please select no more than one LCD controller option."

Marlin/pins_ANET_10.h

  * LCD / Controller
  *
  * Only the following displays are supported:
- *  ANET_KEYPAD_LCD
+ *  ZONESTAR_LCD
  *  ANET_FULL_GRAPHICS_LCD
  *  REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
-*/
+ */
 
 #if ENABLED(ULTRA_LCD) && ENABLED(NEWPANEL)
   #define LCD_SDSS           28
  * ===================== LCD PINOUTS ==================================
  * ====================================================================
  *
- *   Anet V1.0 controller           | ANET_KEYPAD_LCD   | ANET_FULL_      | RepRapDiscount Full      | Thingiverse RepRap wiring
+ *   Anet V1.0 controller           | ZONESTAR_LCD      | ANET_FULL_      | RepRapDiscount Full      | Thingiverse RepRap wiring
  *   physical   logical   alt       |                   | GRAPHICS_LCD    | Graphics Display Wiring  | http://www.thingiverse
  *     pin        pin     functions |                   |                 |                          | .com/thing:2103748
  *------------------------------------------------------------------------------------------------------------------------

Marlin/pins_RAMPS.h

 
 #endif // ULTRA_LCD
 
-#if ENABLED(ANET_KEYPAD_LCD)
+#if ENABLED(ZONESTAR_LCD)
   #define LCD_PINS_RS        64
   #define LCD_PINS_ENABLE    44
   #define LCD_PINS_D4        63
   #define BTN_EN2            -1
   #define BTN_ENC            -1
   // pin 29 N/C
-#endif // ANET_KEYPAD_LCD
+#endif // ZONESTAR_LCD

Marlin/pins_SANGUINOLOLU_11.h

       #define ST7920_DELAY_3 DELAY_0_NOP
     #endif
 
-  #else  // !LCD_I2C_PANELOLU2 && !LCD_FOR_MELZI
+  #elif ENABLED(ZONESTAR_LCD) // For the Tronxy Melzi boards
+
+    #define LCD_PINS_RS         28
+    #define LCD_PINS_ENABLE     29
+    #define LCD_PINS_D4         10
+    #define LCD_PINS_D5         11
+    #define LCD_PINS_D6         16
+    #define LCD_PINS_D7         17
+    #define ADC_KEYPAD_PIN       1
+
+    // Not used
+    #define BTN_EN1             -1
+    #define BTN_EN2             -1
+
+  #else  // !LCD_I2C_PANELOLU2 && !LCD_FOR_MELZI && !ZONESTAR_LCD
 
     #define BTN_ENC             16
     #define LCD_SDSS            28 // Smart Controller SD card reader rather than the Melzi