Gets in-memory runtime minifiy cache working, ensures no files can be accessed at the root, adds config to enable in-memory and configure a cache buster including a timestamp cache buster.

src/Umbraco.Core/Configuration/Models/RuntimeMinificationCacheBuster.cs

@@ -0,0 +1,9 @@
+namespace Umbraco.Cms.Core.Configuration.Models
+{
+    public enum RuntimeMinificationCacheBuster
+    {
+        Version,
+        AppDomain,
+        Timestamp
+    }
+}

src/Umbraco.Core/Configuration/Models/RuntimeMinificationSettings.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Umbraco.Cms.Core.Configuration.Models
+{
+    public class RuntimeMinificationSettings
+    {
+        public bool UseInMemoryCache { get; set; } = false;
+
+        /// <summary>
+        /// The cache buster type to use
+        /// </summary>
+        public RuntimeMinificationCacheBuster CacheBuster { get; set; } = RuntimeMinificationCacheBuster.Version;
+    }
+}