Auto merge of #618 - fitzgen:extra-assertions, r=emilio

Extra assertions and cargo features

* Clean up testing-only cargo features

  This commit ensures that all of the cargo features we have that only exist for
  CI/testing purposes, and aren't for external consumption, have a "testing_only_"
  prefix.

* Define extra assertion macros

  This commit defines a new set of assertion macros that are only checked in
  testing/CI when the `testing_only_extra_assertions` feature is enabled. This
  makes it so that *users* of bindgen that happen to be making a debug build don't
  enable all these extra and expensive assertions.

  Additionally, this removes the `testing_only_assert_no_dangling_items` feature,
  and runs the assertions that were previously gated on that feature when the new
  `testing_only_extra_assertions` feature is enabled.

r? @emilio

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