Add a "simple" mode for saving video

[joeyballentine]

People often have confusion as to why the quality (crf) slider is what it is, or what the preset option does. If you don't know FFMPEG, then those things make no sense. Those users probably also don't know anything about encoders or formats.

So, I made a "simple" mode. It gives only a few options for formats, and uses a quality slider from 0-100 that sets both the CRF and preset values. This should make the node much more easily usable and intuitive for non-superusers

Open questions:

1. Should AVI be an option for lossless video?
2. Should we use HEVC instead of H.265 in the parens?

[RunDevelopment]

Should AVI be an option for lossless video?

Not sure. If it's easy to add, then why not. I just think that it should have "lossless" in the name of the option if you add it.

Should we use HEVC instead of H.265 in the parens?

I think both are used, so maybe both?

[joeyballentine]

I decided not to add AVI for now. We can add that if anyone wants it. I also added a AVC and HEVC to the h264 and h265 labels, respectively. Also, I made it hide the quality slider for GIF (like advanced mode does)

[RunDevelopment]

I think we need a label for the additional params text box. Otherwise gtg