* squash: Extracts parsing disco info in utility method.

* squash: Extracts parsing disco info identities and features in utility method.

* squash: Skip disco-info on reconnection.

Doing disco info queries only once.
If the call is longer than 24-hours turn credentials may be expired.

* feat: Adds handler for early messages with conference info data.

* feat: JiConOp handling for shard name.

* squash: Drops unneeded check.

* squash: Changes message type to service-info.

* squash: Moves utility parseDiscoInfo out of the Caps class.

* feat: Drops unused code about handling incoming caps changes.

* fix: Drop using private fields outside JitsiParticipant.

* fix: Save guards _features to be always empty and nver undefined.

* fix: Ignore caps changes relaying only on features in presence.

* fix: Drops unused parameter of join and sendPresence.

* feat: Skips using disco-info for features.

Uses presence to publish features added externally.
Recognizes jigasi participants using a specific presence extension used by jigasi.

* squash: Fixes tests.

* squash: Adds e2ee to the features in presence.

* squash: Fix function name and docs.

* squash: Drops detecting jigasi from initiator.

Using the newly added presence features.

* squash: Drops unused var.

* squash: Fix comments.

* squash: Adds a constant and for E2EEE feature.

If there's no capabilities version mapping to user's jid
still allow to discover features (that's the case for Jicofo).

* ref: Fix imports order.

* feat: Adds display name required connection event.

The version change is invoked from add/remove features which controls whether to submit the presence.

Attempts to fix this race condition:
1. Web client joins a conference.
2. Electron client joins the same conference.
3. Web client requests capabilities of Electron
   using version 1111.
4. Electron adds remote control capability,
   settings its version to 2222.
5. Electron responds to web client's requests
   but with features of 2222.
6. Web client caches request under 1111.
7. Any future calls to get features for a client
   with version 1111 will incorrect include the
   remote control capability.

When the main domain advertises component with type 'speakerstats' every participant will send message to the component with the name of the room where this happen.

ESLint 4.8.0 discovers a lot of error related to formatting. While I
tried to fix as many of them as possible, a portion of them actually go
against our coding style. In such a case, I've disabled the indent rule
which effectively leaves it as it was before ESLint 4.8.0.