opal v2.0.1

Fixed

• The output resampler in opalSample multiplied the 16.16 interpolation fraction by the
  step between two consecutive chip samples in int. Both factors reach 65535, so the
  product overflows a 32-bit signed integer whenever a loud track swings more than half
  of full scale in one chip sample, which OPL3 material with both banks and rhythm mode
  does routinely. The result is undefined behavior: a garbage sample under a plain
  compiler, and an immediate abort under UBSan or any toolchain that traps on signed
  overflow. The multiply is now 64 bit, in the new opalInterpolate helper. Output for
  every non-overflowing sample is unchanged, so this is bit-identical to 2.0.0 wherever
  2.0.0 was defined at all.