Add back the drive stats to the home screen

selfdrive/ui/qt/widgets/drive_stats.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <QJsonDocument>
+#include <QLabel>
+
+class DriveStats : public QFrame {
+  Q_OBJECT
+
+public:
+  explicit DriveStats(QWidget* parent = 0);
+
+private:
+  void showEvent(QShowEvent *event) override;
+  void updateStats();
+  inline QString getDistanceUnit() const { return metric_ ? tr("KM") : tr("Miles"); }
+
+  bool metric_;
+  QJsonDocument stats_;
+  struct StatsLabels {
+    QLabel *routes, *distance, *distance_unit, *hours;
+  } all_, week_;
+
+private slots:
+  void parseResponse(const QString &response, bool success);
+};