Rename variables named entc to something more appropriate.
Just pass the name as char const* to register_node_reader() and let the function construct the ident.
Made provided API independent of NDEBUG.
Removed redundant include.
rewrite irio import/export code generation for attributes

Avoid "preparation" of export/import commands which baked in values like
the node name which might be changed in subclasses.
- Remove the builtin conversion table in favor of a simple rule to
  convert a C type to a function name part.