Currenty doing: Code duplication fix

• Same decompressTrack() function present in both old and new decoding
• decompressTrackStore() present both in old and new decoding
  • In the old one creates a ClusterNative object and stores in a vector using emplace_back
  • In the new one stores the ClusterNative object using plain array + counter
• Try to remove old decompressTrack()
  • Use variadic templates on new decompressTrack() function
  • Move decompressTrackStore() with vectors in new code
  • Depending on the unpacked template, the correct decompressTrackStore() is called

Still to do:

• Update standalone benchmark to use new decoding with --compressionStat
• Check pp decoding performance (was a bit lower than expected)