adapter.aasx: allow deleting files from SupplementaryFileContainer
#278
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AbstractSupplementaryFileContainer
andDictSupplementaryFileContainer
are extended by adelete_file()
method, that allows deleting files from them. Since different files may have the same content, references to the files contents inDictSupplementaryFileContainer._store
are tracked via_store_refcount
. A files contents are only deleted from_store
, if all filenames referring to these these contents are deleted, i.e. if the refcount reaches 0.