Added diagram caching

Added diagram caching to avoid re-render unchanged diagrams.
To enable caching, the configuration option cachedir must be set to a path to be used as a cache.

The plugin is now available also in chocolatey (thanks to @majkinetor).

Renamed module from `plantuml-markdown` to `plantuml_markdown`

THE PLUGIN NAME HAS CHANGED FROM plantuml-markdown TO plantuml_markdown.
The the tools configuration (markdown, mkdocs, ecc.) MUST be changed accordingly.

Sorry for this new change in the module name, but the dash was a big problem for who needs to import it.

Fixed UTF-8 character handling in `svg_inline` format

2.0.2

Fixed handling of UTF-8 characters in `svg_inline`

Fixed package bundle

Fixed a small error in building bundles for pip installation.

PlantUML server support

With this version the diagram rendering can be done using a PlantUML server.
To overcome a Python module name conflict with another library, THE PLUGIN NAME HAS CHANGED FROM plantuml TO plantuml-markdown.
The the tools configuration (markdown, mkdocs, ecc.) MUST be changed accordingly.

Added options to limit image size

• Added width and height attributes
• Fixed navigable links in inline SVG (resolves #18)

Added two new output formats

• svg_object: generate a object tag for embedding svg diagrams
• svg_inline: insert svg diagram directly in the document

Fixed wrong HTML attribute `classes`

The generated HTML was containing a wrong classes attribute instead of
the class attribute.

GitLab/GitHub support and variuos fixes

• added support for GitLab/GitHub syntax
• added a title macro option, for generating diagram tooltips
• fixed generation of class and alt attributes
• fixed handling of unicode characters

Inline images

• images are now inlined, no more files around
• added txt diagram format

Big thanks to @kubilus1.