Motivation for changes:

Clean up some ambiguity and problems with seen CLI

Detailed changes:

• --tasks could take multiple arguments, which meant the positional value parameter could be consumed by this if it was placed before the value. It has been replaced by --task which only takes one task name, but can be specified multiple times.
  old: seen forget valuetoforget --tasks taska taskb new: seen forget --task taska --task taskb valuetoforget
• The value before could be a task name which would delete all the seen entries for that task. I didn't like the ambiguity of this, so you now must specify the task name with the --task parameter, along with a wildcard for the value.
  old: seen forget sometaskname new: seen forget --task sometaskname *
• Allows multiple tasks to be specified for seen add (only one could be done at a time before)
• Also fixes a crash if there were things that looked like rich markup in entry titles for seen search

Addressed issues/feature requests:

• Fixes Seen forget --tasks behaviour #3442

CLI Usage

# Add a seen value to 2 tasks
flexget seen add --task task1 --task task2 "the seen thing"
# Forget everything from one task
flexget seen forget --task task1 *
# Forget everything from tasks matching a glob
flexget seen forget --task movie-* *

To Do:

• Bump version to indicate breaking change
• Write upgradeactions