Moved more stuff into Abstractions

src/Umbraco.Core/Composing/RuntimeLevelAttribute.cs

@@ -1,21 +0,0 @@
-using System;
-
-namespace Umbraco.Core.Composing
-{
-    /// <summary>
-    /// Marks a composer to indicate a minimum and/or maximum runtime level for which the composer would compose.
-    /// </summary>
-    [AttributeUsage(AttributeTargets.Class /*, AllowMultiple = false, Inherited = true*/)]
-    public class RuntimeLevelAttribute : Attribute
-    {
-        /// <summary>
-        /// Gets or sets the minimum runtime level for which the composer would compose.
-        /// </summary>
-        public RuntimeLevel MinLevel { get; set; } = RuntimeLevel.Install;
-
-        /// <summary>
-        /// Gets or sets the maximum runtime level for which the composer would compose.
-        /// </summary>
-        public RuntimeLevel MaxLevel { get; set; } = RuntimeLevel.Run;
-    }
-}