fix: throwing when LatLng is NaN

[monsieurtanuki]

Now we throw an Exception when a LatLng is NaN - at projection time.
Doesn't look particularly good, but at least we avoid a memory leak, and anyway, who put the NaN in the first place?

The code isn't bullet proof as developers may extend Crs differently, but in most cases that should work.
And it's good enough.

[JaffaKetchup]

Sorry for not responding sooner. Would it make sense to check if either number is not finite? Then we'll protect against infinities as well.

[monsieurtanuki]

@JaffaKetchup Had to fix unrelated code too, because of parameter_assignments lint.

But the build fails because of too strict parameters.
We cannot reach a pub.dev score of 160/160, because we use Logger that only reaches 150 (doesn't officially support wasm).

[monsieurtanuki]

@JaffaKetchup I've just "fixed" the score part: we now expect the top score - 10.