Make the Vertex have a proper type bitfield instead of a primary field

[tmadlener]

BEGINRELEASENOTES

• Rename the Vertex primary field to type and make it a 32 bit unsigned integer
• Introduce 3 reserved bits and accompanying utility / ExtraCode functionality for checking primary, secondary or tertiary vertex
• Introduce setBit and checkBit utility functionality and also use that for the MCParticle extra code

ENDRELEASENOTES

Fixes #328

• Needs check / changes for downstream consumers (these have to go in simultaneously)
  • Switch to new Vertex functionality k4EDM4hep2LcioConv#74 (ready for merge)
  • Switch to Vertex updates in EDM4hep HEP-FCC/FCCAnalyses#382 (under review)

[Zehvogel]

LCFIPlus already distinguishes between secondary (tertiary etc.) vertices and V0 vertices (although by writing them into different collections). We could add V0 another bit for V0 directly imo.

[tmadlener]

Does LCFIPlus only split the collections between V0 and non-V0, or also between primary, secondary (, tertiary)?

[Zehvogel]

3 collections: primary, buildup, buildup_V0