Split out conference type (text/av) from identifier.

[iphydf]

This change is 

[zugz]

Looks good, except that now the field is called 'identifier' while elsewhere in the code it's called a 'uid'. I think it would be clearer if the field were also called 'uid'. I'd also suggest renaming 'uid' to 'id', to avoid the potential for misunderstanding it as "user ID" and to fit the spec, which uses this terminology ('id' for the group public key and 'identifier' for the 33-byte type+id).

[iphydf]

@zugz would you suggest renaming the public API function as well?

[iphydf]

Anyway, I've renamed identifier to uid.

[zugz]

* Saturday, 2018-07-21 at 15:07 -0700 - iphydf <notifications@github.com>:

@zugz would you suggest renaming the public API function as well?

i.e. the ones you added a couple of weeks ago in 90a63e8? Yes, for the same reasons. Unless you have a reason to prefer "uid"?

[iphydf]

@zugz done.

[iphydf]

Should we revert "id" back to "identifier"?

[zugz]

Should we revert "id" back to "identifier"?

I'd say it's better to have new terminology for the new concept, to minimise confusion between versions. It also means we don't have to change the spec. <img class="emoji" title=":lgtm_strong:" alt=":lgtm_strong:" align="absmiddle" src="https://reviewable.io/lgtm_strong.png" height="20" width="61"/>