Header Map use general datastructur inern

[rustonaut]

The header map uses a specialized data structure which can make it hard to maintain, read, understand, extend etc.

• [x] is there a total order keeping multimap (/key-value vector with fast key based access) => No ;=(
  • [x] if not extract the data structure part out of header map
• [X] use the general datastructure
• [X] store header meta information in an additional hashmap which contains
  • [X] the can appear multiple times asspect
  • [X] the contextual validator
  • [ ] possible the original Header TypeId + "type name" for debug issues
    • (type name might not be supported from the rust's side)