Implement format attribute

[Jesus89]

In:

• Legends
• Popups
• Widgets

https://github.com/d3/d3-format

[andy-esch]

Thinking through this a little, this would be something that's set at the Layer level and inherited by legends, popups, and widgets.

[Jesus89]

Aha, but what if you want a different format for different widgets or popups?

[andy-esch]

Good question 🤔
Maybe each has a separate format that overrides the Layer-level one?

[Jesus89]

OK, so we can add the format attribute to the layer, but also to the legend, popups and widgets.

Layer(
    legend={
        ....
        format='...'
    },
    popup={
        'hover': [{
            ....
            format='...'
        }, ...]
        'click': ....
    },
    widgets=[{
        ....
        format='...'
    }, ...]
    format='...'
)

[joshtemple]

It would be really great if you could customize the number format in legends, popups, etc. For example, sometimes the scientific notation introduced by #818 is not desired. Or perhaps you want to round a number or add a currency symbol in front of the number.

You should be able to provide some kind of string to indicate how you'd like the numbers to be formatted.

[Jesus89]

Fixed in #1626, CartoDB/airship#689. Release 1.0.3