Design and develop a podcast player application with Swift and AVFoundation to allow users to stream and playback their favorite podcasts. The app should have an intuitive and user-friendly interface with options to search, filter, save, and share podcasts. It should also include features like bookmarks, playback speed control, and support for multiple audio formats. The design of the app should be minimalistic and modern, with customizable themes and color schemes. Ensure that the app is scalable and can handle large amounts of data, with fast loading times and minimal buffering. Test the app thoroughly, fix any bugs or issues, and provide comprehensive documentation on its functionality and usage.
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