Odfdo

- Refactor cell properties to get easier and more consistent access to cell values. Some new properties added: Cell.decimal, Cell.int, Cell.bool, Cell.duration, Cell.datetime, Cell.date.
- Add a `.rdf` manifest file if it is missing (this should only happen in very rare manipulations).

Changed

- Refactoring of Cell properties.
- Refactoring of Container class to ensure creation of manifest file.

Added

- Add properties: `Cell.decimal`, `Cell.int`, `Cell.bool`, `Cell.duration`, `Cell.datetime`, `Cell.date`.

- Refactor Table and Row caching, removing useless `_caching` attribute from many classes.
- Remove module scriptutils.

Changed

- Refactoring of Table and Row caching.
- Replace in `container.py` and scripts `show.py` and `styles.py` the previous functions of scriptutils.

Removed

- `odfdo.scriptutils.py` removed.

- Allow XML export of base64 encoded images (preparing for flat ODF export).
- Update XML propertires to ODF 1.2.

Changed

- Refactoring of Document.add_file() and export to XML format.

- The `Meta` class which manages the `meta.xml` part has two new methods `as_dict()` and `as_json()` to export its content.
- Improved "pretty" export of documents.

Added

- Add methods: `Meta.as_dict()`, `Meta.as_json()`, `MetaTemplate.as_dict()`, `MetaAutoReload.as_dict()`, `MetaHyperlinkBehaviour.as_dict()`.

Changed

- Small XML file formatting changes when saving with "pretty=True".

Fix some small rendering issues for Markdown export.

Fixed

- Better Markdown export for strike style, non break space, successive tags, line breaks, footnotes

- Change in `str(Paragraph)` which now includes a `'\n'` at the end of the string.
- The `odfdo-to-md` script is renamed to `odfdo-markdown` and should be functional. Markdown export of .odt files supports all standard formatting features (including tables) except quoted text (no clear semantic equivalent in the ODF standard).
- Improved `__str__` methods for many classes: Document.body, Paragraph, Span, Link, Unit, Note, Annotation.
- Some added methods: `Document.get_parent_style()`, `Document.get_list_style()`, `Style.get_list_style_properties()`, `Style.get_text_properties()`.
- The new `Element.inner_text` property is now the preferred way to access an element's inner text.

Added

- Add methods: `Document.get_parent_style()`, `Document.get_list_style()`, `Style.get_list_style_properties()`, `Style.get_text_properties()`.
- Add propterty `Element.inner_text`.

Changed

- Script `odfdo-to-md` renamed to `odfdo-markdown`.
- `str(Paragraph)` now includes a `'\n'` at the end of the string.
- Output of the __str__ method modified for many elements.