[FEATURE]: Color gradient according to how many chararcter left.

[Simakeng]

Just an aesthetic perspective feature request.

Like set two breakpoints with gradient enabled:

"LWI.breakpoints": [
        {
            "color": "rgb(0, 255, 0, 0.6)",
            "column": 80
            "gradient" : true,
        },
        {
            "color": "rgb(255, 0, 0, 0.6)",
            "column": 102,
            "gradient" : true,
        }
    ],

Then when count in the range, interpolate the color between green and red using character count.