Remove compatibility with podio < 1.0

[tmadlener]

This is a summary issue to keep track of the places where we have some special casing for pre 1.0 podio versions. These can obviously only be addressed one podio v1.0 is out.

• Pre processor checks introduced in Transparently introduce switch to optional param values #305
• Pre processor checks to switch from ROOTFrame{Reader,Writer} to ROOT{Reader,Writer} introduced in Change ROOTFrame{Writer,Reader} to ROOT{Writer,Reader} #263 and Use non-deprecated versions of SIO Reader/Writer #293