Release 1.1.0-preview 3 (#6)

Release roll-up snapshot of C#/C++ codebase at version 1.1.0-preview.
This release matches the current shipping nugets.

src/Serialization/HybridRow.Native/AllowEmptyKind.h

@@ -0,0 +1,27 @@
+// ------------------------------------------------------------
+//  Copyright (c) Microsoft Corporation.  All rights reserved.
+// ------------------------------------------------------------
+
+#pragma once
+
+namespace cdb_hr
+{
+  /// <summary>Describes the empty canonicalization for properties.</summary>
+  enum class AllowEmptyKind : unsigned char
+  {
+    /// <summary>Empty and null are treated as distinct.</summary>
+    None = 0,
+
+    /// <summary>Empty values are converted to null when written.</summary>
+    EmptyAsNull = 1,
+
+    /// <summary>Null values are converted to empty when read.</summary>
+    NullAsEmpty = 2,
+
+    /// <summary>
+    /// Empty values are converted to null when written, and null values are converted to empty
+    /// when read.
+    /// </summary>
+    Both = EmptyAsNull | NullAsEmpty,
+  };
+}