add ability to save rageshake logs locally

[uhoreg]

as suggested by lazz https://matrix.to/#/!DgvjtOljKujDBrxyHk:matrix.org/$1487800184342672TpnWN:matrix.org. It could also help with timeout issues as the user could figure out some alternative way of sending logs

[ara4n]

@kegsay was this something you considered at all during the impl, ooi?

[kegsay]

I don't know how you plan to save the logs to disk, but the logs themselves are gathered completely in-memory in this array so it should be easy to then write these to files.

[shirishag75]

did you mean https://github.com/vector-im/riot-web/blob/master/src/vector/rageshakesetup.js as https://github.com/vector-im/riot-web/blob/master/src/vector/rageshake.js#L460 doesn't seem to be anymore present.

Update - I guess you mean https://github.com/matrix-org/matrix-react-sdk/blob/master/src/rageshake/rageshake.js

[kegsay]

Yeah, I should've linked to a static commit, my bad. Here you go

[turt2live]

matrix-org/matrix-react-sdk#3849 is an attempt at getting the logs at least into an archive and downloaded. Per the PR, it works fine in Firefox but Chrome hates it.