Queue Find-Replace, Save All and Close All actions.

Hi! Awesome application.

When doing big find-replace actions, the action is backgrounded. If I don't notice that it is executing in the background, sometimes I'll go to use the "Save all" action, and it won't execute completely, as files are still being modified in the background.

So when I try to use "Close All" immediately after "Save all", it doesn't execute the operation and asks me if I want to save files.

Might be better if these are put into some sort of FIFO queue so that requests for operations like this occur in sequential order.