Sync more hash-url-params for iD

[tordans]

This commit includes a few console.logs since it is still WIP.

It solved part of the issue described in #3031:

Whenever I pan the map in iD, the osm-hash-params get updated with the current iD-in-iframe-configuration.
However, click actions in the iD iframe (eg changing the map layer) don't trigger this update until I also pan the map afterwards.

This is all I could contribute with my limited knowledge of the code. I am pretty sure there is a more elegant solution to this. However, I also think this would already be a bit better than what we have right now …

[tordans]

Lets close this draft for now, it is too old to be useful.

I am still hoping for some improvements here in the future … like

• one set of url params ?/& that are the same for all/most editors and part of the URL and synced by iD
• all the other editor state params as part of the URL hash #

That should allow for the website to have a clear and shared URL search params API … but still editors can have custom state to make the UI sharable.

There was some work on syncing the editor state with the URL in facebook/Rapid#1404