Compares the user provided strategies to those that are
required (the reference). Will throw an error if not all values
of reference have been defined.
     
    
    Usage
    validate_strategies(strategies, reference)
 
     
    
    Arguments
- strategies
 
named list of strategies.
 
- reference
 
list or character vector of strategies that need to be defined.
 
 
    
    Value
    Will throw an error if there is an issue otherwise will return TRUE.