.NET

Add Subtitle Support for MediaElement #53

Job	Run time
Build Library (windows-latest)	8m 51s
Build Library (macos-15)	6h 0m 16s
Build Sample App using Latest .NET SDK (windows-latest)	12m 24s
Build Sample App using Latest .NET SDK (macos-15)	38m 46s
sign	0s
release	0s
	7h 0m 17s

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