moc doesn't understand C++14 binary integer literals

The bug manifested for me exactly like #59351, so I'll steal its repro:

namespace unit {
  int xx = 0b1010'0101;
}
int yy = 0b0101'1010;
namespace xf {
  class HT16K33: public QObject {
     Q_OBJECT
  };
}

The lexer in moc parses octal/decimal/hex literals correctly, but doesn't recognize that `0b` introduces a binary integer literal. This is typically benign, except in combination with digit separators. Just as in #59351, the digit separators are treated as delimiting a multicharacter literal and chaos ensues.