What are the full details on the (a) exact terms of reference, (b) scope of work, (c) project timelines, including the commencement date, (d) anticipated completion date and (e) appointment of key role players to deliver the project for the (i) revamping of the Groote Schuur Estate, (ii) roads and parking at the Bryntirion Presidential Estate and (iii) facilities management at the Union Buildings and The Presidency offices?