add the features api parameter which enables the list of features

[ferdibiflator]

Fixes #4393

features api parameter is added for enabling the features in the list (, is the splitter)

Also the hash is being updated when the user toggles features

[bhousel]

Thanks @ferdibiflator - this looks really good! I'll check it out some more tomorrow, in the meantime can you also update the API.md doc "url parameters" sections to include the new option?

[ferdibiflator]

@bhousel I found a problem with boundaries feature. At the moment this one may not be enabled through the url parameter features.
Because the boundaries is disabled within the /index.html:

id = iD.Context()
            .assetPath('dist/');

id.features().disable('boundaries');

id.ui()(document.getElementById('id-container'), function() {

I suggest to disable this one in accordance with some logic within the modules/renderer/features.js. But I don't know in which cases the boundaries should be disabled.

[ferdibiflator]

Hello @bhousel. Any news?

[bhousel]

Any news?

This looks good, and I'll merge it any day now, thanks for being patient.
I'm merging about 1 PR/day but for this one I would like to check out the branch locally and test.

[bhousel]

Hey @ferdibiflator I tried it out and I think I'm going to change it so that the url querystring contains the hidden features, instead of the shown features.. It's just a little less wordy that way. What you did is great, so I'm just going to merge as-is and make the change in a followup commit 👍

[bhousel]

btw @ferdibiflator re this:

I found a problem with boundaries feature. At the moment this one may not be enabled through the url parameter features

I worked around this in 30ff683 by changing the code in index.html to only disable boundaries if there is no disable_features list in the querystring. This means that if somebody really wants the boundaries enabled, they can add an empty param like &disable_features= to the url.

I mostly consider index.html as sample code that anyone is free to modify if they are reusing iD for other things.