Use elm-mdl and elm-time to implement the following UX

[Natim]

[Natim]

• [ ] The blue select box is an autocomplete select box where you can search for a Timezone.
• [ ] The green button is optional for now but it allow you to download a CSV file with the table
• [ ] When clicking on a line of the table, you can select the date and the time for this Timezone

The Model

type alias Model =
    { mdl :
        Material.Model
        -- Boilerplate: model store for any and all Mdl components you use.
    , current_utc_time : Time.DateTime
    , timezones : List Time.TimeZone
    }

• [x] We can add timezone to the Set using the blue input field
• [x] When clicking on a line we can remove the line using a button that will remove the TimeZone from the List
• [x] In the view, we can use the DateTime as an UTC datetime and display the DateTime for each TimeZone
• [x] The slider allow to move the UTC DateTime value from midnight the day before to midnight the day after.

[Natim]

Refs #10