Use Fastlane to get them from Apple after processing, them upload them.

Also make sure WebRTC dSYMs are included when uploading.

Fixes: https://github.com/jitsi/jitsi-meet/issues/6665

The welcomePageEnabled and pictureInPictureEnabled props on mobile have been
converted to feature flags.

Inverts the icons to follow more what's in the phone app instead of
CallKit.

Time has come. We need to enable bitcode. It's optional for iOS targets, but
mandatory for the entire project if there is a watchOS target. Since we have a
watchOS target, it's time to enable it.

Co-authored-by: Pawel Domas <pawel.domas@jitsi.org>

- handle some weird bug
(https://github.com/firebase/firebase-ios-sdk/issues/233)
- use a common function to extract the URL off a dynamic link

The SDK will now search for an asset called "CallKitIcon" on the main bundle,
and fallback to a built-in asset it it's not there, allowing SDK users to
customize it by just adding asset with that name.

It complicates automated builds.

Signing wouldn't work, disabling it and enabling it again created these changes.
Oh well!

Consolidate all failure cases into a single one: CONFERENCE_TERMINATED. If the
conference ended gracefully no error indicator will be present, otherwise there
will be.

Since the SDK may be embedded with other apps, we need to recognize our custom
URL scheme and universal links in order to tell the user if we will process the
request or not.

Make them configurable with sane defaults.

- cleanup
- API simplification (single loadURL method)
- JitsiMeet singleton for linking helpers and globals
- Linking moved to app

We are going to implement the invite dialog *inside* the SDK, so there is no
need to have all this machinery anymore.

This marks our switch to CalVer: http://calver.org/

Major: year
Minor: release number
Patch: build (in case we need to retry)

Load it at build time from a "dropbox.key" file. The file should contain the API
key in a single line.

Read it from the GoogleService-Info.plist file and apply it into Info.plist.