exprtools cleanup
replace old trigsimp code with call to futrig

- also, trigsimp will always operate in a deep fashion so that
  keyword is now ignored
- there is no more caching of the results
- tests related to assumptions were removed since the patterns that
  were being tested were removed and those assumptions are part of
  the new Fu-like transforms.
- test that have a slightly new form were modified
- as_trig is now hyper_as_trig (which will help if someone is looking
  for a function related to hyperbolic functions)