Wikitextparser

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- Add ``wikitextparser.remove_markup`` function and ``WikiText.plain_text`` method.
- Improve detection of parameters and wikilinks.
- Add ``get_bolds`` and ``get_italics`` methods.
- ``WikiLink.wikilinks``, ``WikiList.get_lists()``, ``Template.templates``, ``Tag.get_tags()``, ``ParserFunction.parser_functions``, and ``Parameter.parameters`` won't return objects equal to ``self`` anymore, only sub-elements will be returned.
- Improve handling of comments within wikilinks.
- ``WikiLink.text.setter`` no longer accepts None values. This was marked as deprecated since v0.25.0.
- Drop support for Python 3.4.
- Remove the deprecated ``pprint`` method. Users should use ``pformat`` instead.
- Allow a tuple of patterns in ``get_list`` and ``sublists`` method. The default ``None`` is now deprecated and a tuple is used instead.

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- Add a new parameter, ``level``, for the ``get_sections`` method.

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- Fixed a rare bug in handling lists and template arguments when there is newline or a pipe inside a starting or closing tag.
- ``Section.title`` will return None instead of ``''`` when the section does not have any title.

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- Invoking the deleter of ``Section.title`` won't raise a RuntimeError anymore if the section does not have a title already.

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- Add a deleter for ``Section.title`` property. (32)

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- Fixed a bug in ``WikiText.get_lists()`` which was causing it to sometimes return items in an unordered fashion. (31)