Refactor color sensor code to separate file

This change aims to modularize the robot code by moving the color sensor code to a separate file.

Summary of Changes

• Add color.h and color.cpp file
• Move all functions to the color files
• Move the global variables associated with color to color.cpp
• Add a calibrateWhite and calibrateBlack() function

include/color.h

+#include <Arduino.h>
+
+#define LEFT_RED_HUE_THRESHOLD 8
+#define RIGHT_RED_HUE_THRESHOLD 8
+
+typedef struct
+{
+    float r;
+    float g;
+    float b;
+} Rgb;
+
+typedef struct
+{
+    Rgb min = Rgb{0, 0, 0};
+    Rgb max = Rgb{255, 255, 255};
+} ColorSensorCal;
+
+typedef enum
+{
+    CALIBRATE_BLACK,
+    CALIBRATE_WHITE,
+    CALIBRATE_READY,
+} CalibrationState;
+
+extern CalibrationState calibration_state;
+
+void setupColorSensor();
+
+void printRGB(const Rgb &value);
+
+void getColorValues(Rgb &left_value, Rgb &right_value);
+
+float computeHue(const Rgb &rgb);
+
+void calibrateBlack();
+void calibrateWhite();