This adds support for 128-bit float versions of SCALE, NEAREST, MOD, MODULO, SET_EXPONENT, EXPONENT, FRACTION, SPACING and RRSPACING.
This PR does not include support for COMPLEX(16) intrinsics. Note that (fp ** int) operations do not require Float128Math library, as they are implemented via basic F128 operations, which are supported by the build compilers' runtimes.