Replace exception when transforming to screen coordinates with gentler solution.

[pantopela]

Feature description

Currently, Axis.Transform(double x) throws for 'very large' screen coordinates (in debug mode only).

A 'softer' alternative (as this is not necessarily an error) would be to clamp to some very large value (1E5, for example).

[pantopela]

#if DEBUG
            // clamp very large screen coordinates
            // May produce artifacts, but seems nicer than throwing

            s = Math.Max(-100000, Math.Min(s, 100000));

#endif