Enum valued components need a default or have to be required

[wurzka]

This issue is motivated by SAP/abap-file-formats-tools#150
Following types need a default value or have to become required:

• CLAS

  abap-file-formats/file-formats/clas/type/zif_aff_clas_v1.intf.abap

  Line 6 in 5153863

  TYPES ty_category TYPE n LENGTH 2.

• DSFI

  abap-file-formats/file-formats/dsfi/type/zif_aff_dsfi_v1.intf.abap

  Line 8 in 5153863

  TYPES: ty_engine TYPE zif_aff_types_v1=>ty_object_name_30.

• ENHO 1

  abap-file-formats/file-formats/enho/type/zif_aff_enho_v1.intf.abap

  Line 19 in 5153863

  TYPES ty_customizing TYPE c LENGTH 1.

• ENHO 2

  abap-file-formats/file-formats/enho/type/zif_aff_enho_v1.intf.abap

  Line 105 in 5153863

  TYPES ty_filter_type TYPE c LENGTH 1.

• ENHO 3

  abap-file-formats/file-formats/enho/type/zif_aff_enho_v1.intf.abap

  Line 39 in 5153863

  TYPES ty_comparator TYPE c LENGTH 2.

• FUGR

  abap-file-formats/file-formats/fugr/type/zif_aff_fugr_v1.intf.abap

  Line 7 in 5153863

  TYPES ty_status TYPE c LENGTH 1.

• FUNC

  abap-file-formats/file-formats/fugr/type/zif_aff_func_v1.intf.abap

  Line 146 in 5153863

  TYPES ty_release_state TYPE c LENGTH 1.

• INTF

  abap-file-formats/file-formats/intf/type/zif_aff_intf_v1.intf.abap

  Line 6 in 5153863

  TYPES ty_category TYPE n LENGTH 2.

• SCP1

  abap-file-formats/file-formats/scp1/type/zif_aff_scp1_v1.intf.abap

  Line 77 in 5153863

  TYPES ty_operation_at_activation TYPE c LENGTH 1.

[wurzka]

ENHO 2 and ENHO 3 will be fixed when #409 is addressed.