(194/212) 497 - Update C++ mode

I haven't done any serious C work in years. Are there other new key words? I've read that there are now binary literals and that long numbers can have separators to make them easier to read. What else is there that would affect syntax highlighting?

There are four new string literals introduced: http://en.cppreference.com/w/cpp/language/string_literal
I think the first three are easy to implement, but I don't know how to implement the last one (raw string literal, e.g., R"foo(Hello World)foo") using jedit mode.