misc/wthrr: update to 0.7.0

Breaking Changes:
- Use rust-specific .ron config file format @tobealive in #53
    - Check wthrr-the-weathercrab#config for new defaults
    - The config file is now handled without using the confy crate to
      fully utilize the new format's features
    - Improved handling of configuration file errors with warnings and
      indicators
- Updated graphs @tobealive in #54
    - To increase details, the graph height now spans two rows instead
      of one (configurable).
    - New dotted and custom((char; 8)) options

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