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Move the panic handling logic from the `unwind` module to `panicking`
and use a panic counter to distinguish between normal state, panics
and double panics.
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This is part of some cleanup I did while investigating #28129.
This also ensures that `on_panic` is run even if the user has registered too many callbacks.
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The `register` function is unstable and it is not used anymore, hence
it can be removed (together with the now-unused `Callback` type and
`static` variables).
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Resolve the TLS PANICKING variable just once and re-use it as needed.
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The registration of `panicking::on_panic` as a general-purpose
callback is overcomplicated and can fail.
Instead, invoking it explicitly removes the need for locking and paves
the way for further improvements.
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Unwinding across an FFI boundary is undefined behaviour, so we can mark
all external function as nounwind. The obvious exception are those
functions that actually perform the unwinding.
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This commit does some refactoring to make almost all of the `std::rt` private.
Specifically, the following items are no longer part of its API:
* DEFAULT_ERROR_CODE
* backtrace
* unwind
* args
* at_exit
* cleanup
* heap (this is just alloc::heap)
* min_stack
* util
The module is now tagged as `#[doc(hidden)]` as the only purpose it's serve is
an entry point for the `panic!` macro via the `begin_unwind` and
`begin_unwind_fmt` reexports.
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