Maintain limits on ViewBox scaling

[NilsNemitz]

As described in #2001 , the absolute limits of values represented by double-precision floating-point values can be reached very quickly by zooming out in logarithmic mode: The AxisItems start calculating with out of range values when the logarithmic representation exceeds +/-308, which can be reached with two or three spins of the mouse wheel.

In normal mode, it takes a little longer to get there, but it is similarly possible to create failures by simply zooming out too far.

This PR initialized the range limits in normal mode to be +/-1E307 (close to the absolute range limits, with a slight extra margin to avoid earlier out-of-range values in internal calculations. It also applies additional limits of about +/308 to the allowed ViewBox scaling range when in logarithmic mode, corresponding to log10 of the range limit.

Downsides:

• ViewBox now has to be made aware when logarithmic mapping is activated for one of the axes, which was not the case previously.
• The limiting code now executes on every update, although I do not expect the limited number of additional calculations to present a noticeable limit to performance.

I am hoping for comments.

This closes #2001.

[j9ac9k]

Upon further check for adding a test, I noticed the axes change, but the rendering doesn't; short of some kind of assertImageMatch or something like that; this might be a tougher case to test for; and given this PR fixed an issue, I'm going to merge this as is.

Thanks for the PR @NilsNemitz and thanks for generating the example of the issue in #2001 @pijyoi