Accept feature projection in GeoJSON constructor

[tschaub]

This adds support for a featureProjection option to the GeoJSON constructor.

See #5687.

[marcjansen]

Nice work, thnaks Tim. I have added one question, which you'll answer with ease, I guess.

Good to be merged otherwise.

[marcjansen]

Where did rightHanded and decimals go?

[tschaub]

If rightHanded or decimals are provided in option, these will be applied to the return.

[marcjansen]

Ahh yes, I somehow didn't see the options being passed in. Thanks for the clarification, @tschaub.

[fredj]

do we want to mark this option stable?

[tschaub]

I think it makes sense to call this stable. I'll merge as is, and if there is disagreement, we can change it before the release.

[tschaub]

Thanks for the review @marcjansen and @fredj.

[bartvde]

@tschaub locally tests fail with make check for me:

  1) ol.format.GeoJSON #writeGeometry accepts featureProjection:

      expected [ 10, 19.999999999999986 ] to sort of equal [ 10, 20 ]
      + expected - actual

       [
         10
      -  19.999999999999986
      +  20
       ]

  2) ol.format.GeoJSON #writeGeometry respects featureProjection passed to constructor:

      expected [ 10, 19.999999999999986 ] to sort of equal [ 10, 20 ]
      + expected - actual

       [
         10
      -  19.999999999999986
      +  20
       ]

[thhomas]

I get the same error in make test.