Changes for v1.0.0

[DanChaltiel]

Deprecations

• Remove crosstable(.vars)
• Remove mentions of only_round left in funs.R

Removed arguments should be silently captured from the ellipsis for retrocompatibility.
No need for a deprecation notice; documentation and time should be enough.

Tests/effects

• remove crosstable(test_args) altogether (and same for effects).
  Instead, default to test=NULL and change that to test=ct_test() which comes from crosstable_test_args().
  Keep test=TRUE for default.
• In ct_test(), replace keywords summarize and tabular with numeric and categorical and simplify the argument names: crosstable_test_args(numeric = my_test)
• accepter des chaînes comme "auto", "fisher", "logrank", "or", "coxph" en plus des fonctions custom