Import, XML-TRS, custom import parameters

Create a new mechanism to insert XML-TRS specific import parameters UI widgets:

• Editions: display locutor names (true/false) (see #2993)
• Editions: display Transcriber metadata (true/false)
• Editions: create a new page for each new Section
• Textual planes: index interviewer speech (true/false)

(from redmine: issue id 3002, created on 2021/01/20 by Matthieu Decorde)

added import type::task + 1 deleted label

changed milestone to %TXM 0.8.2 - 13NOV 1.0

closed

assigned to @mdecorde