This MR implements part of changes needed to support HepMC3 in the Generator filters. Most of the changes are either mechanical replacement of the GenParticle* to GenParticlePrt or usage of auto for complicated types.
The migration strategy for the GeneratorFilters subpackage has the following cases:
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In case the codes of the filter don't depend on the exact HepMC version nothing is changed.
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In case the codes of the filter don't depend on the exact HepMC version after the replacement of GenParticle* with GenParticlePrt, this replacement is done.
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In case the migration needs a small change ( typically only the loop over particles), the change is done in a way that would allow inserting 1-2 lines of HePMC3 specific code behind the #ifdef guards in the future MR. These are implemented in another branch.
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In case it is simpler to rewrite the whole algorithm in HepMC3, nothing is done. The actual code is implemented in another MR and will be committed separately.