Add openpilot tools

tools/cabana/chart/tiplabel.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <QLabel>
+
+class TipLabel : public QLabel {
+public:
+  TipLabel(QWidget *parent = nullptr);
+  void showText(const QPoint &pt, const QString &sec, QWidget *w, const QRect &rect);
+  void paintEvent(QPaintEvent *ev) override;
+};