Release 4.5.0, merge feature/media-optimizations

[ceaglest]

Update video-app-ios to take advantage of new APIs in 4.5.0 clientTrackSwitchOffMode and contentPreferencesMode and migrate off the deprecated APIs maxTracks and renderDimensions.

• https://github.com/twilio/twilio-video-app-ios/pull/156
• https://github.com/twilio/twilio-video-app-ios/pull/164
• https://github.com/twilio/twilio-video-app-ios/pull/167
• https://github.com/twilio/twilio-video-app-ios/pull/168

Testing

• Building on CI

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