Use model units to define text boxes font size

[#57248996]
Convert text boxes font size from MML (instead of fontScale)

[#57248996]

Note that Classic MW has constant "nm to pixel ratio" which equals to
1:100. We can use in to define font size in 'nm'.
Don't force authors to overwrite all object properties in interactive JSON

[#57248996]

Previously when author wanted to overwrite text box "x" property,
he had to define its all properties in interactive JSON, e.g.:

"textBoxes": [
      {
        "text": "Separated Oil and Water",
        "x": 0.92,
        "y": 1.96,
        "layer": 1,
        "frame": "rounded rectangle",
        "fontSize": [
          0.12
        ],
        "backgroundColor": "rgb(232,231,231)",
        "anchor": "upper-left"
      }
    ]

Now it's enough to specify only options that you want to overwrite:

"textBoxes": [
      {
        "x": 0.92,
        "y": 1.96
      }
    ]
Tweak / fix / polish interactives after text boxes font size fix

[#57248996]
Revert "model fontScaling when actual aspectRatio != aspectRatio"

This reverts commit bb82fd4328ab932763ebd52d66bab5224c21e078.
Revert "when model is same size font will render the same"

This reverts commit 9cffd50d816d177e5d80969e0a45e6ad002fd4e3.
Revert "handle font-size for smaller and larger modelViews"

This reverts commit 3db1d3622cc84ee20d3059ce9f97bf7dfecea376.
Revert "isolate modelView from Interactive aspectRatio/font-scaling"

This reverts commit 1b4bc3db16259d0cffb5c03e00b00b179f8de138.
Update text fixtures after changes in text boxes definitions

[#57248996]
Fix text boxes in 'particleMixing'

[#57248996]
Merge branch 'master' into textbox-fix

Conflicts:
	src/interactives/interactions/particleMixing.json
Bump jQuery to 2.0.3
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