• Added per-account folder location settings options dialog window that allows to set distinct ham/spam training folder URIs for mail accounts.
• Added dark Thunderbird themes and OS color modes support which is limited to the message header pane (background of the Rspamd symbols) as Thunderbird dark mode seems not consistent yet.

• Fixed moving/copying messages to "per-account" training folders from subfolders. In previous add-on versions per-account training folders worked only for moving/copying from the root folders and 1 level deep.
• Restored add-on options item in the context menu.
• Fixed groupboxes display in the main add-on options window.

• The add-on preferences tab converted to a dialog window.
• Now preferences in the main add-on options window are saved instantly after they have been changed.