base: data_set: Rewrite data_set using @dataclass...@dataclasses should be used to hold only data. Since dataset only
encapsulates data, re-writing it using a dataclass makes it more
readable and easier to follow.
wqflask: Add new js file for processing menu entries...*
wqflask/wqflask/static/new/javascript/dataset_select_menu_edit_trait.js:
New file. Copy of dataset_select_menu_orig.js that will later modified...
* wqflask/wqflask/templates/edit_trait.html: Use :point_up:.