convert: Add sc12-sc16 converters

Create missing sc12-sc16 and sc16-sc12 type converters. To avoid
replicating the full sc12 converter class object, overload the
converter calls with C++11 std::enable_if metafunctions. When
used with std::is_floating and std::is_integral templates, this
allow a single template interface with compile time function
selection and static type checking.

Note the below std::enable_if interface is confusing, but quite
effective in this case.

  typename enable_if<is_floating_point<type>::value>::type* = NULL

Fixes: #966
Related: #967, #1721

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