[Tizen] MediaElement control support

[rookiejava]

Description of Change

This PR is a tizen implementation of MediaElement (#3482).

Limitations and Known Issues

• Most features of MediaElement are supported, but KeepScreenOn is not supported due to tizen 4.0 platform constraints.
• MediaView (MediaElement) is not allowed on Tizen TV products, because of security policy for digital media contents. Please use Tizen.TV.UIContols instead.
• https:// is not supported on the tizen emulator, Use http:// instead for streaming playback on the emulator

Issues Resolved

• fixes for Tizen [F100] MediaPlayer View #1692

API Changes

namespace Xamarin.Forms.PlatformConfiguration.TizenSpecific

Added:

• public interface IVideoOutput
• public interface IMediaPlayer
• public interface IPlatformMediaPlayer
• public enum VideoOuputType
• public enum DisplayAspectMode
• public enum PlaybackState
• public class BufferingProgressUpdatedEventArgs

namespace Xamarin.Forms.Platform.Tizen

Added:

• public class AspectToDisplayAspectModeConverter
• public class MediaElementExtension
• public interface IMediaViewProvider

Re-implemented:

• public class MediaElementRenderer

namespace Xamarin.Forms.Platform.Tizen.Native

Added:

• public class MediaPlayer
• public class MediaPlayerImpl
• public class LayoutCanvas
• public class EmbeddingControls

Platforms Affected

• Tizen

Behavioral/Visual Changes

None. This is a new control.

Testing Procedure

Go MediaElementDemoPage.

PR Checklist

• Targets the correct branch
• Tests are passing (or failures are unrelated)