…undation

This patch replaces the current DirectShow-based windows media player
implementation with one based on the MediaFoundation API

This patch modifies the track media type property to return an
enumeration value instead of a string, in order to ensure that the media
type string used in the track list is consistent between platforms.

This patch changes the return type of player track offset and duration
properties to MCPlatformPlayerDuration as these values may overflow the
current uint32_t return type

This patch implements the underlying platform player API functions used
to provide the 'tracks', 'trackCount', and 'enabledTracks' properties
of player objects

…acks

This patch reduces the work done by platform players when setting the
enabledTracks property by only changing the enabled state of tracks
added or removed from the enabledTracks.

This is useful for some player implementations (e.g. Windows
MediaFoundation) which need to reload the media source when enabling or
disabling tracks.

This patch updates the dictionary entries for the "enabedTracks",
"trackCount", "tracks", and "loadedTime" properties to show that the
support for these properties has changed on Windows due to the switch
to MediaFoundation.

In addition, references to QuickTime have been removed as these are
now obsolete.

This patch adds a release note for the change of implementation in the
Windows player control from DirectShow to MediaFoundation.