MGLCompassDirectionFormatter should have granularity option

[1ec5]

MGLCompassDirectionFormatter currently provides the full 32 points of the mariner’s compass, which is good for maritime use cases but overly technical for the most common use case, terrestrial navigation UI. There should be a property that controls the formatter’s granularity, with the following options (naming suggestions welcome):

• MGLCompassStyleCardinal (4 points)
• MGLCompassStyleMainWinds (8)
• MGLCompassStyleHalfWinds (16)
• MGLCompassStyleQuarterWinds (32)

The default would be MGLCompassStyleMainWinds, whereas it is currently effectively MGLCompassStyleQuarterWinds.

/cc @willwhite

[stale]

This issue has been automatically detected as stale because it has not had recent activity and will be archived. Thank you for your contributions.

[1ec5]

This would’ve been nice for mapbox/mapbox-navigation-ios#2077, but at least we have a workaround: round the degree measurement to increments that ensure the right granularity.

[stale]

This issue has been automatically detected as stale because it has not had recent activity and will be archived. Thank you for your contributions.