Small language features (C++17)

Allows static_assert without a message.

Allows typename as well as class for template template parameters.

Adds nested namespace definitions namespace a::b::c {}.

Allows qualification conversions on pointers to arrays of pointers (core issue 330).

Introduces the term 'forwarding reference' for T&& in deduction contexts.

Adds u8 character literals.

Adds __has_include.

Names 'default member initializer' for brace-or-equal-initializers of members.

Rewords inheriting constructors so they behave like other using-declarations (core issue 1941 et al).

Allows aggregates with public base classes.

Allows direct-list-initialization of enum class values from integers.

Allows range-for begin and end to have different types.

Adds hexadecimal floating-point literals.

Introduces the term 'templated entity'.

Allows pack expansions in using-declarations.

Allows a template template argument to match a more general template parameter (DR).