[Enhancement] [Favorites] Add "Refresh & Clear" button

[ganego]

The favorites panel has two main buttons "Refresh" and "Clear".
"Refresh" reloads all threads and looks for new posts.
"Clear" reloads all threads and removes 404'd ones.

Problem:

• If I want to refresh all threads and clear all 404'd ones, I have to click two buttons, wait twice as long and produce twice the server traffic.

Solution:

• Add a new button: "Refresh & Clear". It will fetch all threads and then remove the 404'd ones.

Thank you

[SthephanShinkufag]

"Clear" works on all entries of Favorites list, it's true.

"Refresh" reloads all threads

Nope. "Refresh" works only on boards of imageboard where you click that button due to parser restrictions and script initialization for a specific open imageboard.
Dollchan can't refresh all threads from other imageboards/engines.