Moved runtime abstractions and added SemVer + extensions to abstractions.

src/Umbraco.Core/Sync/ServerRole.cs

@@ -1,28 +0,0 @@
-namespace Umbraco.Core.Sync
-{
-    /// <summary>
-    /// The role of a server in an application environment.
-    /// </summary>
-    public enum ServerRole : byte
-    {
-        /// <summary>
-        /// The server role is unknown.
-        /// </summary>
-        Unknown = 0,
-
-        /// <summary>
-        /// The server is the single server of a single-server environment.
-        /// </summary>
-        Single = 1,
-
-        /// <summary>
-        /// In a multi-servers environment, the server is a replica server.
-        /// </summary>
-        Replica = 2,
-
-        /// <summary>
-        /// In a multi-servers environment, the server is the master server.
-        /// </summary>
-        Master = 3
-    }
-}