default normalization handled by specific normalization index instances.
ContextIndex uses ExistentialTypes and has a Map of arbitrary index instances.
Interpreter and Query Processor are not depending on any index instance anymore.
Todo: some functions like binary serialzation are still to implemented, but
i think this is the right way to go.
Available ContextTypes are configurable via interpreter config.
This way its possible for the user to create add integrate own
index implementation instances without the need of framework
changes.
removed unused function
Context-Types have a name now. This way we can have multiple Context-Types
representing a CDate with different index implementations.
removed depricated default normalization by type
using normalizer index instances for default type normalization now
fixed test-suites