Previously you'd access the render queue from the render settings screen which
was arguably the wrong way around (e.g. you weren't able to access the queue
when your current keyframes were incorrect even if you only wanted to render
those in the queue).
Now the render button opens the queue which can open a new settings popup. To
save people who don't need the queue from always having to go through it, the
queue will immediately open a new settings popup if does not yet have any jobs.
Similar to 3fedc22 in effect and cause. However tasks are executed, they just
cannot be submitted pre-1.14 because MC would continuously hold the lock on the
scheduledTasks queue for the entire renderVideo call.
