During preloading, check that all classes that have been included
as part of the preload script itself (rather than through opcache_compile_file)
can actually be preloaded, i.e. satisfy Windows restrictions, have
resolved initializers and resolved property types. When resolving
initializers and property types, also autoload additional classes.
Because of this, the resolution runs in a loop.

We provide `NumberFormatter::CURRENCY_ACCOUNTING` to wrap
`UNUM_CURRENCY_ACCOUNTING `[1].

[1] <https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/unum_8h.html#a4eb4d3ff13bd506e7078b2be4052266dae97cdd7ed612d07d251021c076efb1c5>

When we change back the bucket key on a class linking failure,
make sure to reload the bucket pointer, as the class table may
have been reallocated in the meantime.

Also remove a bogus bucket key change in anon class registration:
We don't actually rename the class in this case anymore, the RTD
key is already the final name.

We already changed the behavior for __set() in f1848a4. However, it
seems that this is also a problem for all the other property magic,
see bug #78904.

This commit makes the behavior of all the property magic consistent:
Magic will not be triggered for uninitialized typed properties, only
explicitly unset() ones. This brings behavior more in line how
non-typed properties behave and avoids WTF.

Closes GH-4974.