cppquiz
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Support more chars in refs
All currently existing refs in cppquiz are supported, 297 out of 20945 in C++23 index are unsupported (160 containing an asterisk, 131 ending in a right parenthesis, 4 ending in a quotation mark, 2 ending in an exclamation mark).
Fixes https://github.com/knatten/cppquiz/issues/344.