Date Time Pickers, Temporarily Disable Encoding.default

[jdunkerley]

Pull Request Description

• Widgets for Date_Time, Time_Of_Day and Time_Zone.
• Disable Encoding.default for now as big performance impact on CSVs.

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  TypeScript,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• Unit tests have been written where possible.