Interpolate Checkbox

Hello,

I came across a very neat feature.

It can be used to make animated Textures look way cooler in some cases.

The feature can be activated by adding this code to the .mcmeta file:

"interpolate": true

If a user clicks on the --> Interpolate? <-- checkbox in the animation editor in MCreator, the .mcmeta file could look like this:

{
  "animation": {
    "frametime": 10,
    "interpolate": true,
    "frames": [
      1,
      2,
      3,
      2,
      1
    ]
  }
}

Here is a link to a video, where you can see what interpolation does: 

https://youtu.be/WUS1N-aawcc?t=491

Would be nice to see this feature in MCreator :D