iOS: Address 10+ compiler warnings and general issues in source project

We currently have a number of (non-critical) warnings in the iOS source, caused by some PR's over the last months. Examples

• Unknown selector-warnings because of text-field changes (selector is in place, but not referenced correctly)
• Unknown selector-warning because of APSAnalytics (a recent updated missed to expose it)
• Deprecating warnings (about AUTHORIZATION_AUTHORIZED which is technically identical to AUTHORIZATION_ALWAYS)
• Missing 1024x1024px launch-screen (development-only, missing since Xcode 9 update)
• Fix memory leaks
• Fix an issue where the VideoPlayer would crash after closing and waiting for deallocation (~ 30s)
• Fix an issue where the thumbnail-generation of the video-player would block the UI

To fix this, it requires two small PR's to aps_sdk and titanium_mobile