Adding new validation rules for orders and drugOrders.

- Null check for careSetting, encounter, urgency, startDate, action field.
     - Null check for dose, dose units, route, frequency for drugOrders with SIMPLE dosingType
     - Null check for instructions for  drugOrders with FREE_TEXT dosingType
     - Null check for dosing_instructions for drugOrders for any other dosingType.
     - Null check for quantity, quantity units, and number of refills for drugOrders with outpatient careSettings.
    
    Fixed tests failing due to these new validations. Fixed standardTestData.xml to create orders which honour these validations.
    
    Removing voiding of Orders & Obs from patient void handler.
    These are automatically voided in RequiredDataAdvice. Had to remove to fix some failing tests.