Scriptabit

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* Implemented character level set and increment/decrement.

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* Very minor changes to PyPI metadata and README file.
* Made the update and creation of the notification panel optional. Use the
`use-notification-panel` command line argument to control the behaviour.
* Made the task tags configurable. Use the ``--tags`` argument to pass a comma
separated list of tags that will be used with any task created in Habitica. If
you use ``--tags ""`` then no tags will be created or applied.

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* Changed pet_care logic so it detects quest and magic pets implicitly. This
means I don't need to manually update the code for new quest or magic pets.
* Added tag management features to ``sb-tasks``. You can now list tags, list
unused tags, and delete unused tags. I didn't add a function to delete a tag
by name as this is trivial to do in the web app.
* Fixed the issue in 1.16.0 where plugin names would log as "None".
* Added sample task CSV file showing the required layout for ``sb-csv``
* Updated documentation for pet care and tasks.

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* New tasks plugin. Run with ``sb-tasks``.
* Added minimum requests version to setup.py.
* Added entry point for spellcasting plugin ``sb-cast``.
* Cleaned up argument parsing, so running a plugin entry-point with the --help
argument only shows help for that plugin.
* Running ``scriptabit --help`` now only shows help for the main application
rather than all possible args from all plugins.
* Added documentation for spell casting.
* Added fallback help display so that plugins that fail to define a ``print_help``
function will use the default help display.

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* Adding increment functions for XP, MP, HP. I already have direct set functions
but the new ones are easier when you just want to increment the values up or
down.
* Expanding the banking feature to allow mana and health banks as well as gold.
* Removed the bank name option, as it made supporting different bank types more
complicated.

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* Added HP preservation option to spellcast plugin. This allows casting Blessing
spells that don't heal the player.