Update interface names - remove prefix

[wurzka]

Closes #151

[larshp]

REPS + FUNC are not ABAP object types, as far as I know

[schneidermic0]

FUNC + REPS are LIMU object types but no R3TR object types.

I have just talked to the experts. There is no overlap between LIMU and R3TR object types (even if the key of transport tables like TADIR or E071 make it look like that there is an overlap; PGMID is part of the object key).

This means we could use them uniquely in the system. However, this would mean for REPS that we should remove it from object type FUGR to a generic one that can also be used by other object types (e.g., module pools)

[larshp]

okay, this leads back to question A in #146 (comment)

and I suggest reopening #128

in https://github.com/SAP/abap-file-formats/blob/main/doc/specification.md it mentions both "object type" and "sub object type", so as mentioned in "A" it seemed pretty clear that it was R3TR types

[schneidermic0]

Documentation for sub object object types is changed in #154.

Therefore, the filenames for LIMU object types as well.