Remove staged tuples

Until now tuples had two implementations, one with staging and one with plain inline
and inliner constant folding. The second one was used in practice as the first one could not be used if tuples where used (macros expanded) in the library due to bootstrapping issues.

These implementations were never intended to actually be used, they mostly showed the power of match types, inline and staging. Eventually, this logic will be special cased in the compiler for performance.

Author: nicolasstucki