v0.8.0

Added

• Improved widget handling, now use a dict to store components instead of parsing code.
  Makes it possible to subscribe to events with expressions for the component.
• Cache behaves like dict, e.g. cache['data'] = [1, 2, 3].
• Support Ant theme to customize all Ant components, added in the App class.
• Vertical option for slider. (#204)
• Document run command.
• Document exceptions.

Breaking

• Removed cache save and load functions in favor of dict functionality.