C++: add 'Raw String Literal Prefix' style and restricts the style of invalid raw string
Before: ```cpp foo(R"", 42); // ~~ Raw String Delimiter // ~~~~~~~ Error foo(R"a(bla bla)a", 42); // ~~~~ ~~~ Raw String Delimiter // ~~~~~~~ Raw String ``` Now: ```cpp foo(R"", 42); // ~ Raw String Literal Prefix // ~~ Error foo(R"a(bla bla)a", 42); // ~ Raw String Literal Prefix // ~~~ ~~~ Raw String Delimiter // ~~~~~~~ Raw String ```
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