Director and CLI information

These enquiries return extended pointers of a null-terminated string in BHL:

IN:  
    BC = NQ_Dev ($8C00)      fetch current device
    BC = NQ_Dir ($8C03)      fetch current directory
    BC = NQ_Fnm ($8C06)      fetch current filename match string

Registers changed after return:
     A..CDE../IXIY same
     .FB...HL/.... different