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* Fixed an issue with `Container` and `ZipFile` in Python pre-3.8.

  When the name of a file added to container contained a non-ASCII character,
  a consequent `read()` of this file failed with an error:
  ```
  zipfile.BadZipFile: File name in directory 'FILE' and header b'FILE' differ.
  ```
  After closing the ZipFile, reading files was OK.

  As a solution, now the container is opened in read-only mode and all write operations
  are performed after closing the read-only zipfile, opening it in append mode and
  closing it again.

* Added a public property `zip_file` to the `Container` instance which uses a cached
  read only zip file handle, opening it if necessary.

* Added a public property `zip_writer` to the `Container` instance which opens
  an appendable zip file handle, clearing the `zip_file` cache.

* Merged the `verify_container` and `_verify_container_contents` methods
  because the latter made little sense on its own as a private method.

* Replaced `_add_mimetype()` with `_create_container()` which creates and initializes
  the buffer in one single place.

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