Change private vars into projected for UnitOfWorkFactory

It doesn't really make sense to have a virtual factory class an not being able to access its ObjectTypes list in the extended class.

Author: Wim Velzeboer

sfdx-source/apex-common/main/classes/fflib_Application.cls

@@ -36,8 +36,8 @@ public virtual class fflib_Application
 	 **/
 	public virtual class UnitOfWorkFactory
 	{
-		private List<SObjectType> m_objectTypes;
-		private fflib_ISObjectUnitOfWork m_mockUow;
+		protected List<SObjectType> m_objectTypes;
+		protected fflib_ISObjectUnitOfWork m_mockUow;
 
 		/**
 		 * Constructs a Unit Of Work factory