[apps/shared] New automatic zoom on curves

Initial zoom for displaying curves is computed according to the
following rules :
  - For polar and parametric curves, the algorithm has not changed.
    Vertical and horizontal ranges are chosen in order to display the
    full curve with orthonormal graduations.
  - For cartesian curves, the horizontal range is chosen in order to
    display all points of interest (roots, extrema, asymptotes...).
    The vertical range is fitted to be able to display those points, but
    also cuts out points outside of the function's order of magnitude.

Change-Id: Idf8233fc2e6586b85d34c4da152c83e75513d85c

apps/shared/function_graph_controller.h

@@ -44,9 +44,6 @@ private:
   virtual FunctionGraphView * functionGraphView() = 0;
   virtual FunctionCurveParameterController * curveParameterController() = 0;
 
-  // InteractiveCurveViewRangeDelegate
-  InteractiveCurveViewRangeDelegate::Range computeYRange(InteractiveCurveViewRange * interactiveCurveViewRange) override;
-
   // InteractiveCurveViewController
   bool moveCursorVertically(int direction) override;
   uint32_t modelVersion() override;