Remove implicit conversions to Int and String etc

[janekdb]

Port has an implicit conversion to Int and String. Other types sport similar convenience views. However this notion does not apply to other type with more structure such as IP4Address.

Replace existing implicit views that have value with explicit conversions.

Consider a common method on all types that converts to a String that matches to the same value.

val t = new OctetPair(x, y)

t.asXXX match {
  case OctetPair(x, y) => will match
}

• Add @deprecated(since = "2.1.0")
• Remove support
• Add replacements where necessary
• Update documentation