Implements a basic version of the MacroService for U4-940

Adding a static ServiceFactory class for easy access to the various services in a non-singleton way.
Adding a Resolver for MacroPropertyTypes.
Updating the CoreBootManager and PluginManager to include the MacroPropertyTypeResolver.

src/Umbraco.Core/Models/IMacro.cs

@@ -89,6 +89,6 @@ namespace Umbraco.Core.Models
         /// Returns an enum <see cref="MacroTypes"/> based on the properties on the Macro
         /// </summary>
         /// <returns><see cref="MacroTypes"/></returns>
-        MacroTypes FindMacroType();
+        MacroTypes MacroType();
     }
 }

src/Umbraco.Core/Models/Macro.cs

@@ -105,7 +105,7 @@ namespace Umbraco.Core.Models
         /// Returns an enum <see cref="MacroTypes"/> based on the properties on the Macro
         /// </summary>
         /// <returns><see cref="MacroTypes"/></returns>
-        public MacroTypes FindMacroType()
+        public MacroTypes MacroType()
         {
             if (!string.IsNullOrEmpty(Xslt))
                 return MacroTypes.Xslt;