Hovercraft

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- Nothing changed yet.

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- Added the pre-check for file or folder existence when serving or
creating the presentation.

- Juan Bondi made videos of the installation.

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This release moves Hovercraft! over to impress.js 1.0.0. This version of
impress.js has many new features and a new plugin system, which has plenty of
benefits, especially since some features of Hovercraft!, primarily
impressConsole.js, now are plugins to impress.js, so that's less
maintenance burden on me.

The most obvious changes from the previous version of Hovercraft! are:

- The ``--skip-help`` argument, and ``:skip-help:`` control now disables
the help popup altogether. This is because impress.js currently has no
way to stop the help from displaying on load except disabling the help
completely. This may change in the future.

- Also switched the default MathJax to 2.7.5, a minor update.
impress.js MathJax extension is simply just Mathjax, there is no additional
integration, so Hovercraft! doesn't change how Mathjax is integrated.

- Hovecraft! now supports the new impress.js "substep" plugin, so that
you can show paragraphs lists item by item (see documentation).

Other changes are:

- You can now include audio and video by including the HTML5 <video> and
<audio> tags in ..raw: html sections.

- Dropped support for Python 3.5, added support for 3.8.

- Many, many documentation fixes and improvements.

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- The ReStructuredText directive "figure" now is translated into the HTML5
tag "figure", with the caption becoming a figcaption tag.

- Restored the warning that you need Python 3.5 or higher when trying to
install with Python 2.

- Simplify in-process execution of Hovercraft! [tonysyu]

- Document how to make custom directives. [tonysyu]

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- Hovercraft! now displays the version number when called with -v or --version.

- New version of impressConsole that includes styling of the previews and
a goto command <G>.

- ``:css-console:`` and ``:css-preview:`` added to style the console and
add extra styles in the previews.

- :auto-console: and -a had stopped working [maxwell-k].

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- Option to display slide numbers [frederikmoellers]

- 51: Positioning relative to other slide [naraesk]

- Removed the code that uses pkg_util to access included templates. We don't
support installing Hovercraft! as a ZIP file anyway, so it only complicates
things for no good reason.

- Support for .. header:: and .. footer:: that can be used for static
content.

- Dropped support for Python 3.3 and 3.4, because I now use recursive glob.

- Templates can now have a resource-directories statements, to specify extra
directories of resources. This can be used in templates for JS libraries,
like MathJax.

- The MathJax argument can now be a local copy.

- Switched the default MathJax URL to https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1