- Unexport Alias Map in order to preserve any custom user aliases that
may conflict with new aliases added to the library itself....need to
copy them for each new validator.
- update error to report alias tag as the error tag and add actualTag to
know what it would have actually been.
now panic less, instead of panicing when data types do not match
in the field and cross field validations, the validation just
fails, because it's true i.e. does nil != 5 pass
or does nil == "string" nope fail
joeybloggs