Huge revamp of CANDataGrid which is used in many places in the

project. Right now the usual mode works but the signal view mode used
in the DBC editor is broken. Committing because the changes are so
major they should be spread out into a few commits

candatagrid.h

@@ -22,6 +22,8 @@ class CANDataGrid;
  *
  * Now the control also tracks which signal is using which bit. The graphical representation does exist now but some tweaking is probably
  * still needed. Also, it seems like it is necessary to allow for a variety of modes.
+ *
+ * And now, CAN-FD added as the cherry on top! It's a mess but really, all this functionality is handy to have.
  */
 
 enum GridTextState
@@ -33,8 +35,8 @@ enum GridTextState
 
 enum GridMode
 {
-    CHANGED_BITS,
-    SIGNAL_VIEW
+    CHANGED_BITS, //traditional view, bunch of bits we color to show what's set and how the bits have changed over time
+    SIGNAL_VIEW //special view for DBC window where we draw the signals in the bits they take up
 };
 
 class CANDataGrid : public QWidget
@@ -57,6 +59,7 @@ public:
     int getUsedSignalNum(int bit);
     GridMode getMode();
     void setMode(GridMode mode);
+    void setBytesToDraw(int num);
 
 protected:
     void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
@@ -66,13 +69,14 @@ signals:
 
 private:
     Ui::CANDataGrid *ui;
-    unsigned char refData[8];
-    unsigned char data[8];
-    unsigned char usedData[8];
-    int usedSignalNum[64]; //so we can specify which signal claims this bit
+    int bytesToDraw;
+    unsigned char refData[64];
+    unsigned char data[64];
+    unsigned char usedData[64];
+    int usedSignalNum[512]; //so we can specify which signal claims this bit
     QVector<QString> signalNames;
     QVector<QColor> signalColors;
-    GridTextState textStates[8][8];
+    GridTextState textStates[8][64]; //first dimension is bits, second is bytes
     QPoint upperLeft, gridSize;
     GridMode gridMode;
     QBrush blackBrush, whiteBrush, redBrush, greenBrush, grayBrush;
@@ -84,6 +88,11 @@ private:
     int xSector;
     int ySector;
     double bigTextSize, smallTextSize, sigNameTextSize;
+    int xOffset;
+    int yOffset;
+    int farX, farY, nearX, nearY;
+    int neededXDivisions;
+    int neededYDivisions;
     QFont mainFont;
     QFont smallFont;
     QFont boldFont;