RAD-23 - Refactor DicomUtils.createHL7Message()
* refactor getORCtype to return CommonOrderControl Enum
* refactor getTruncatedPriority to return CommonOrderPriority Enum
* use new hl7 package to create the hl7 ORM^O01 message
- fix invalid encoding value
- fix wrong line endings from \n to \r as defined by hl7 standard
- fix wrong hl7 version
- fix reversed patient name in message
- fill in datetime into datetime elements instead of date
