Save draft overhaul. Replies are saved in the DB, but only if needed instead of the old method that used the DB for every stage of the reply process. A popup will confirm if the user wants to use the saved draft, but inside the reply activity instead of the thread activity. The draft logic is smarter, it won't try to recover a quote when you are editing or vice versa.

Removed icon-theme setting since it's completely obsolete and unused.