Option to open audio from video automatically upon opening a video

[Calan]

With Aegisub now only playing audio if it is loaded through the Audio menu, an option to automatically load the audio into RAM (i.e. the same way it would if you opened it through the Audio menu) when a video file is opened would be useful.

[nielsm]

Maybe in the next major version... I'm just not sure it would be all that great.

It's two extra clicks to load audio from video, currently, not a whole lot of extra work.

If audio was loaded automatically from video all, per an option, then it would mean waiting extra when you load a video, for the audio to decode. Sometimes you may not want to do that anyway, so you'd have to cancel it. I guess that's fine.
Maybe you don't want the audio display to clutter the screen when you've just loaded video, so should it be hidden? If then, the option to re-display the audio display might need to be made more visible.

I guess it can be done, but it'll take some care.

[plorkyeran]

(In [6224]) Add option to automatically open audio when opening video. Closes #1134.