March 2020 update

* CloudMirror: Clarify manifest requirements #90, fix file sharing modes #89, fix subfolder paths #86
* DpiAwarenessPerWindow: Fix minimum OS requirements #96, fix build definitions for nondefault platforms #27
* D2D samples: Fix pointer truncation bugs #123
* TouchInputDirectManipulation: Fix mouse input #120, #121
* DirectComposition_LayeredWindow: Composition should go under buttons so you can see the buttons #118
* OleDbRowsetViewer: Fix incorrect usage of pwszReserved parameter #117, provide missing icon asset #116
* ManagementInfrastructure: Wrong fields used to check array sizes #106
* ProjectedFileSystem: Minor spelling correction #97
* MediaFoundationTransformDecoder: Multithreading issues #52
* immpad-level3-step3: Fix handling of empty composition strings #32
* Various: Fix leap year date calculations #98

CloudMirror, DpiAwarenessPerWindow, ProjectedFileSystem, Direct2D, DeskBand samples onboarded to docs.microsoft.com/samples.