Antonio Sanchez f0e46ed5d4 Fix pow and other cwise ops for half/bfloat16.
The new `generic_pow` implementation was failing for half/bfloat16 since
their construction from int/float is not `constexpr`. Modified
in `GenericPacketMathFunctions` to remove `constexpr`.

While adding tests for half/bfloat16, found other issues related to
implicit conversions.

Also needed to implement `numext::arg` for non-integer, non-complex,
non-float/double/long double types.  These seem to be  implicitly
converted to `std::complex<T>`, which then fails for half/bfloat16.
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