Add color replacement for b/w

lib/obp60task/OBP60Extensions.h

@@ -5,12 +5,16 @@
 #include "OBP60Hardware.h"
 #include "LedSpiTask.h"
 #include "Graphics.h"
-#include <GxEPD2_BW.h>                  // E-paper lib V2
+#include <GxEPD2_BW.h>                  // GxEPD2 lib for b/w E-Ink displays
 #include <Adafruit_FRAM_I2C.h>          // I2C FRAM
 #include <math.h>
 
 #ifdef DISPLAY_ST7796
-#include <LovyanGFX.hpp>                // TFT LCD lib for ST7796
+    #include <LovyanGFX.hpp>            // TFT LCD lib for ST7796 color displays
+    #undef GxEPD_WHITE
+    #define GxEPD_WHITE  TFT_WHITE      // Replacement color for white on TFT (OBPHardware.h)
+    #undef GxEPD_BLACK
+    #define GxEPD_BLACK  TFT_BLACK      // Replacement color for black on TFT (OBPHardware.h)
 #endif
 
 #ifdef BOARD_OBP40S3

lib/obp60task/OBP60Hardware.h

@@ -43,6 +43,8 @@
     #define OBP_SPI_DIN 48
     #define OBP_TFT_OFFSET_X 10   // ST7796 operating x-offset for centered 400x300 content
     #define OBP_TFT_OFFSET_Y -20  // ST7796 operating y-offset for centered 400x300 content
+    #define TFT_BLACK 0x0109      // Replacement color for black on TFT (RGB565)
+    #define TFT_WHITE 0xFFFF      // Replacement color for white on TFT (RGB565)
     #define SHOW_TIME 6000        // Show time in [ms] for logo and WiFi QR code
     #define FULL_REFRESH_TIME 600 // Refresh cycle time in [s][600...3600] for full display update (very important healcy function)
     #define GxEPD_WIDTH 400       // Display width

lib/obp60task/obp60task.cpp

@@ -9,7 +9,6 @@
 #include <NMEA0183.h>                   // NMEA0183
 #include <NMEA0183Msg.h>
 #include <NMEA0183Messages.h>
-#include <GxEPD2_BW.h>                  // GxEPD2 lib for b/w E-Ink displays
 #include "OBP60Extensions.h"            // Functions lib for extension board
 #include "OBP60Keypad.h"                // Functions for keypad
 #include "OBPDataOperations.h"          // Functions lib for data operations such as true wind calculation