ROOTObjectReader/Writer: allow to skip objects
The ROOTObjectWriter should allow for a configuration parameter which specifies a list of object types to be discarded instead of written to the file.
In many cases it might e.g. not be wanted to store PropagatedCharges
but only all other messages.
This option could work both as a black or a white list - or we might even add both possibilities.
Edited by Simon Spannagel