Allow eliding node sequences from the server response

[adamnovak]

If we want to look at many megabases of sequence, with some kind of simplification, we don't necessarily want to include the node sequences in what we send to the client.

We need a flag in the API request to hide the sequences, and maybe a checkbox on the page (or in the graph track settings?) to control it.

[adamnovak]

First we should come up with a Plan for how this should work, and only then implement it.

[adamnovak]

Shreya's plan

• [X] Work out where the node sequences are configured
• [x] Add a flag to the API request, similar to the existing simplify option
• [x] Make an interface for it (in graph track settings probably, a toggle button in there)
• [x] Connect it all together

Also: make sure the renderer can handle not having sequences client-side

[adamnovak]

• [x] Use switches instead of toggle buttons
• [X] Stop the simplify button moving around
• [X] Icon for simplify button to make it look like it opens something
• [x] Style switches nicely

[adamnovak]

Switches could look like this iOS example: