Moved PublishedCache from Umbraco.Web into .Net standard project.

Returned to compiling state with a number of things to check and some temporarily commented out functionality.

src/Umbraco.Infrastructure.PublishedCache/NuCache/DataSource/PropertyData.cs

@@ -0,0 +1,28 @@
+using System;
+using Newtonsoft.Json;
+
+namespace Umbraco.Web.PublishedCache.NuCache.DataSource
+{
+    internal class PropertyData
+    {
+        private string _culture;
+        private string _segment;
+
+        [JsonProperty("culture")]
+        public string Culture
+        {
+            get => _culture;
+            set => _culture = value ?? throw new ArgumentNullException(nameof(value)); // TODO: or fallback to string.Empty? CANNOT be null
+        }
+
+        [JsonProperty("seg")]
+        public string Segment
+        {
+            get => _segment;
+            set => _segment = value ?? throw new ArgumentNullException(nameof(value)); // TODO: or fallback to string.Empty? CANNOT be null
+        }
+
+        [JsonProperty("val")]
+        public object Value { get; set; }
+    }
+}