Major Changes

Added automatic spoiler-free card creation
- Modified Manager to modify unwatched episodes prior to calling create_missing_title_cards() method
- Updated PlexInterface to tracks file size and spoil status of loaded cards
- Created PlexInterface.modify_unwatched_episodes() method to detect unwatched episodes within Plex to update Episode objects and delete old cards based on requested spoil action
- Updated PreferenceParser class to look for 'unwatched' attribute within plex section
- Updated Show class to look for 'unwatched' attribute to override Plex default
- Example of this implementation with blurring:
- Closed #94
Added TMDbInterface method to get series backdrop
Added optional blur argument to all card types
- If enabled, CardType.BLUR_PROFILE (0x60) is applied to source image post-resize
Rewrote FontValidator, PlexInterface, and TMDbInterface classes to use tinydb databases instead of YAML objects
- These database operations are atomic and much faster (and extensible) than nested dictionaries in YAML
  - Prevents temporary file corruption if quitting the Maker during a R/W operation
- Added tinydb as dependency
- Don't deepcopy Show object
  - Couldn't pickle new TinyDB objects, so deep copying is no longer used by ShowArchive class
- Closed #110

Major Fixes

N/A

Update Plex progress bar after episode existence check
- Has minor performance improvement as frequent progress bar updates are slow
Print results of --read-all-series argument
Don't apply title casing to manually specified titles
- Closed #109
Enabled summary creation by default
Store initialization font_map within Font object