Windows 10 Version 1903 - March 2020 Update

* 360VideoPlayback: Align configurations, reset shader between stages #791 #942
* Clipboard: Add history and roaming scenarios, improve delay-rendering, clipboard change reporting, error-handling.
* CustomSerialDeviceAccess: Fix RequestToSendXOnXOff #1085
* Holographic samples support HoloLens 2 device and emulator
* HolographicFaceTracking: Fix comment about NV12 #834
* HolographicVoiceInput: Fix release build
* PlayReady: Don't create container twice #1159
* RadioManager: Clarify require capabilities #1165
* SpeechRecognitionAndSynthesis: Clarify which scenarios require internet access #725, Update permission links #1002
* UserActivity: Fix protocol navigation #1176
* XamlMasterDetail: Fix navigation problems #344 #345
* SharedContent: Default.rd.xml fixes #950
* Miscellaneous typos: AdvancedCasting #1006, AudioCreation #1006, BluetoothAdvertisement #898, BluetoothRfcommChat #1139, Json #404, Nfc #1039, XamlBind #1169 #1182
* Add missing Line Display sample to TOC #704
* All C++ samples now build in both VS2017 and VS2019.
* All C++/WinRT samples upgraded to C++/WinRT 2.0 #1179
* New: Clipboard (C++/WinRT), JapanesePhoneticAnalysis (C++/WinRT)
* Archived: Advertising, CallerId, Clipboard (C++/CX and VB), CommunicationBlockAndFilter, PhoneCall