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These will be used to remove even more uses of ktn/kti in non-critical
paths.

Since both nodes and instances support some common functionality (names
and indices), we add a class so that we can access these attributes in a
generic way.

This new big patch does a couple of more cleanups in the loading of data
chapter:
  - introduce a Types module that holds most types (except the base
    Node/Instance/etc.) so that multiple other modules can use these
    (instead of only Cluster and its users)
  - bring IAlloc.hs in line with the recent changes of providing data
    types and not strings
  - removal of obsolete Utils.hs json-related functions