[FR]: Ability to apply post-process script to all feeds within a feed category

[RetroAbstract]

Brief description of the feature request

This feature would allow the user to apply all feeds within a feed category a post-process script by right clicking a feed category > Edit selected item > Post-process script.

[martinrotter]

Yes. I plan to add some reasonably good multi-select feed editing capabilities, this is on my internal todo list, but that todo list, my man, is veeeeeery long. There is just too many other things to do in rssguard.

[martinrotter]

Fixed with 5d7cb9d. Select the item (category, account) -> right-click and select "Edit child feeds".