Migration: From Crashlitics to Firebase

[rafaparadela]

Description

Fabric will be deprecated in March of 2020. In this PR we have migrated the next modules to Firebase:

• Fabric: Crashlytics
• Google Analytics

Extra work

• Updated project to use the last version of Swift, Swift 5
• Upgraded project to iOS 10 (minor SDK support)
• Upgraded Localytics
• Update trackers for each screen
• Update trackers for logging events

[miguelangel-dev]

Done in PR https://github.com/47deg/scala-days-ios/pull/75