Scriptabit

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* Updated pet care to handle the candy foods.
* Updated pet care to handle the spooky and ghost potions.
* Added purchase armoire item utility function, with optional repeat.

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* Minor logging changes: config file specifiable via environment variable
(`SCRIPTABIT_LOGGING_CONFIG`). Log statement with the location of the user
plugin directory.
* Added 10 second timeout to http requests.
* Added simple vampire mode - health drain during the day, slower regen at
night.
* Added bank-balance option so that sb-banking with no args can display usage
information.
* Changed main loop so that utility functions don't try to run at the same time
as plugins.
* Removed upper MP limit check when setting mana.
* Added delete all todos utility function (can update to support other task
types later, but todos is all I needed right now).
* Fixed bug where last Trello sync time was displayed in UTC rather than local
time.

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* Made plugin update more robust. Exceptions are caught so that updates can
continue rather than aborting the whole run.
* Implemented simple health drain and regeneration in health effects plugin.
* Refactored plugin notification methods.
* Changed pet care so it only sleeps during feeding if API calls were made
during the last pet.

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* Updated documentation.
* Added new entry points for built-in plugins:

* `sb-banking` instead of `scriptabit --run banking`
* `sb-trello` instead of `scriptabit --run trello`
* `sb-pets` instead of `scriptabit --run pet_care`
* `sb-csv` instead of `scriptabit --run csv_tasks`
* `sb-health` instead of `scriptabit --run health_effects`

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* Added missing supports_dry_run method to pet care plugin, that was preventing
dry runs.
* Fixed incorrect dryrun message in main loop.

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* Added messages and checks for dry run support in plugins.
* Implemented full dry run mode support in banking.
* Implemented full dry run mode support in CSV uploader.
* Implemented full dry run mode support in pet care plugin.
* Implemented full dry run mode support in trello sync plugin.
* Implemented full dry run mode support in the utility functions.
* Updated utility functions so they return the new value set into the character
stats (gold, XP, HP, MP).