Update to 13.19.05

[grojo-ea]

Changes:

• Initialize some variables so MSAN doesn't trip on the inline assembly for some atomic operations.
• Fix a TSAN issue on weak_ptr::lock() and remove ad-hoc atomic increments used there.
• Add copy constructor and copy assignment to fixed_substring to avoid them behaving like strings on copy and leaking memory when the copy is destroyed.
• Add specializations to is_signed and is_unsigned for __int128_t, __uint128_t, char16_t, char32_t so that they behave as expected.
• Add specialization so is_integral<char8_t> works as expected for the new char8_t, which C++20 dictates must be a distinct type.
• Add specializations for numeric_limits<char8_t>
• Fix some test so they compile in C++20.
• Remove unused hint parameters for hash_map::try_emplace.
• Fixes the return type of erase(_if) and the list::remove(_if) according to C++20 standard.
• Fix vector::push_back_uninitialized so it grows with the normal growth factor when pushing back onto a full vector instead of only growing by 1.
• Fix compilation issues when `EASTL_STD_ITERATOR_CATEGORY_ENABLED
• Add algorithms apply_and_remove and apply_and_remove_if for doing something with a value and then removing it.