Is it possible to add "Add formatter" similar to "Add filter"

[Elamurugan-Nallathambi]

What:

• Include a pipe option (Similar to add filter) to format message or date or any part of the event message to particular way

Why:

• If suppose the logs contain url encoded or / escaped lot of strings, the log viewer wants to see them without url encoded, so including a formatter to remove anything thats / to / can help in this situation.

[sevdokimov]

This should help: #24