Version 3.20.02.

[grojo-ea]

Changes:

• Fix fixed_vector_allocators copy constructor so it doesn't default construct the overflow allocator.
• Fix a compiler error with the new version of MSBuild related to __analysis_assume in combination with lambda captures and function templates.
• Fix natvis visualization of rbtree_node.
• Added is_bounded_array and is_unbounded_array type traits from C++20.
• Update is_trivially_copyable to have all the appropriate integral_constant members.
• make add_pointer::type well specified for cv- or ref-qualified function types. type member evaluates to T (didn't compile previously).
• is_unsigned::value now evaluates to true, to match the standard.
• is_member_pointer::value now evaluates to true for cv-qualified member pointers.
• is_const::value and is_volatile::value can now compile for cv- or ref-qualified function types.
• is_function::value now evaluates to true for l-value, r-value, const, volatile, noexcept functions and relevant combinations.
• is_member_function_pointer::value now evaluates to true for l-value, r-value, const, volatile, noexcept member functions and relevant combinations.
• change add_lvalue_reference::type and add_rvalue_reference::type to T for cv- or ref-qualified function types, to match the standard.