1757 mobx new routing

[soyarsauce]

What this PR does

Addresses the first half (routing) of v7-maps-running-prerendering on v8
https://github.com/TerriaJS/drought-map/issues/195
(and the first half of porting #3494)

Additionally, I've disabled the IE11 tests given IE11 doesn't actually work for v8 at the moment.

What this PR doesn't do

As part of another issue/pr,

• The styling for hitting the prerendered routes, that can come separately
• Any extra checks for making UI elements that do route changes with anchor tagged elements instead of buttons

Checklist

• n/a There are unit tests to verify my changes are correct or unit tests aren't applicable (if so, write quick reason why unit tests don't exist)
• I've updated CHANGES.md with what I changed.

[soyarsauce]

@na9da as discussed, let me address the pr comments here when I get a moment, and you can start working on the other 2 points in the desc. Re: the second point, would just be checking that all the links that link you to certain routes are anchor elements - check the prod https://map.drought.gov.au/ for instances, the basic check is turn off javascript and see if you can traverse the catalog from /catalog/ onward

[na9da]

An error pops up on start when loading a static URL. This is because Terria tries to load /proxyabledomains URL. #4834 might be relevant to this problem.

[soyarsauce]

Re:

Would be great if we can get rid of the %2F%2F in the generated URLs, eg: http://localhost:3001/catalog/%2F%2FCesium%20Air

I'm not quite sure how to tackle this, we want to differentiate when a slash is for routing purposes, or if it's for ID purposes. (e.g. we need to be able to have confidence to always encode and decode a URL, without doing any double encoding/decoding etc).

Ideally we don't use such confusing characters in IDs, but is unfortunately a side effect of having IDs like //Cesium Air.

If we didn't encode it as such, we would end up with URLs like http://localhost:3001/catalog///Cesium%20Air and would prove difficult when trying to set up the routing. What do you think?
@na9da

[soyarsauce]

An error pops up on start when loading a static URL. This is because Terria tries to load /proxyabledomains URL. #4834 might be relevant to this problem.

Great to see you've reproduced what I had, you'll have to investigate why this is an issue in v8 but not the v7 port (I'm thinking why is it not an issue in v7?*)

[na9da]

For greater performance styled-components use CSSOM to add styling rules. This means when we pre-render the styles are absent from the dom. We can disable use of CSSOM when pre-rendering by passing a flag to the StyleSheetManager.

[na9da]

Fixes for styling and proxying - TerriaJS/TerriaMap#496

[soyarsauce]

@na9da please check all good and we can do a release :) There is a minor problem at #4940 but we can address later

[na9da]

Approving!
@soyarsauce - Let's tackle #4940 and #4941 later.