Import material map handling from `acts-framework`

The writing/reading and decorating of material maps (currently for ISurfaceMaterial) has been developed in the acts-framework and is ready to be back ported.

This includes:

Plugins/Json: Json reade, writer & decorator of material maps
Plugins/Root: root based reader, writer & decorator of material maps
Material/MaterialWiper.hpp: a simple material decorator that nulls all material (test class)

Edited Jul 04, 2019 by Andreas Salzburger

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