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Merge foo_t and foo_active_t structures in styles

Currently we have:

  • font_t and font_active_t
  • fill_t and fill_active_t
  • border_t and border_active_t
  • protection_t and protection_active_t
  • number_format_t and number_format_active_t

Those *_active_t were introduced in the previous major release to introduce the concept of set or non-set attribute states without changing the current API. But since we are changing the API for the upcoming 0.18 version, we should merge these pairs by using std::optional to express the set or non-set state.