Support for v2 with FunTuple

This MR:

• Adds support for v2 objects:
  • Makes v2 objects as the default type (i.e. containers with item type LHCb::Event::simd_zip_t<SIMDWrapper::Scalar,T>::template zip_proxy_type<LHCb::Pr::ProxyBehaviour::Contiguous>).
  • The types MCParticles and Particles are treated as special cases.
  • Caveat: The functionality of decay descriptor parsing for v2 is not there yet, so we run over all composites in the TES. (Next step of development, but would be a separate MR.)
• Adds ChargedBasic producers.
• Few other improvements in terms of code duplication.

To be tested with: DaVinci!695 (merged)

Closes issue (#34 (closed)) and is related to the master issue (#11 (moved)).

FYI: @graven