* initial work for supporting non-optimised mp4
* Update AppCoordinator.swift
* some refactor and fixed seek for a restructured mp4
* nit
* nit
* nit
* runs swiftlint
* improvements
* improvements
* handles case where we the stream is not seekable for an mp4 file
* better check for mp4, seekable and moov atom
* nit
* fix an issue with seek
* some refactoring