New creates and returns an Error with a pre-defined user output message all methods below that doesn't accept a pointer receiver because actually they are not changing the original message.

NewFromErr same as `New` but pointer for nil checks without the need of the `Return()` function.

NewReporter returns a new empty error reporter.

PrintAndReturnErrors prints the "err" to the given "printer", printer will be called multiple times if the "err" is a StackError, where it contains more than one error.

Prefix the error prefix, applies to each error's message.

Error holds the error message, this message never really changes.

Reporter is a helper structure which can stack errors and prints them to a printer of func(string).

StackError contains the Stack method.