Edited Issue: [RTM] T4 templates and Legacy Object Context code gen strategy enabled when creating an EF6 model from the database if the project is targeting .NET Framework 4 [1561]

If the project is targeting .NET Framework 4 and the user selects EF6 when creating a new model from the database we will add T4 templates but will also set the Legacy Object Context code gen strategy. This results in creating two sets of entities that conflicts with each other. In addition the Code Generation strategy cannot be changed to T4 (the dropdown is disabled).