Matrix Widget API v2

[ara4n]

This should be MSC1236, and is still the closest thing we have to a spec to the widgets which Element implements today. I don't know why it's not showing up in the MSC index, and why the issue number is completely wrong.

Documentation: https://docs.google.com/document/d/1uPF7XWY_dXTKVKV7jZQ2KmsI19wn9-kFRgQ1tFQP7wQ/edit
Author: @rxl881
Date: 16/02/2018

[richvdh]

for clarity: this is how widgets work today, and this just needs writing down in the spec.

[ara4n]

is there a reason not to convert this to MD for consistency & ease of reference?

[turt2live]

just hasn't made it to the top of my list yet. It's getting up there though.