Remove unnecessary imports

[hyrodium]

tuple_type_head, tuple_type_tail, tuple_type_cons, setindex are imported, but unused in the code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.14%. Comparing base (e3773b6) to head (f961d58).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   86.99%   89.14%   +2.15%     
==========================================
  Files           1        1              
  Lines         123      129       +6     
==========================================
+ Hits          107      115       +8     
+ Misses         16       14       -2     

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[Jutho]

Thanks.

[Jutho]

We are getting some errors in our packages building on TupleTools because of this, so I will probably revert it. The idea behind importing these names was that you could write TupleTools.functionname for a number of useful functions for manipulating tuples, irrespective of whether the implementation was provided by Base, or a more efficient implementation was provided in TupleTools. So TupleTools.setindex should just work, even if this is actually just Base.setindex.