Windows 10 Version 1903 - June 2020 Samples Update 2

* LanguageFont: Simplify
* LinguisticServices: Add CharacterGroupings and a Windows Runtime component
* SecondaryTiles: Simplify
* Unicode: Fix edge cases in identifier boundaries
* Fix supported OS version ranges in various sample manifests
* Revisions to sample templates
* New C++/WinRT samples: 3DPrinting (#1133), Calendar, DateTimeFormatting, GlobalizationPreferences, LanguageFont, LinguisticServices, NumberFormatting, SecondaryTiles, Unicode
* Archived C++/CX samples: LanguageFont, LinguisticServices, Unicode