[Feature] Option to enforce integer svg width/height

[adschm]

When using animations (e.g. blinking via @keyframes), Chromium will blur the chart which is particularly visible for text.

An easy solution is to enforce integer width/height. (inspired by [1])

Thus, adding an option to round the svg size to the nearest integer (or doing this by default) would be desirable to have sharp plots.

Blurred (automatic width: 497.328125):

Sharp (manual width: 497):

Note that the referenced article is different from my experiment:

• it is about position, not size
• it requires even values, while in my case integer odd values seem to be fine as well

[1] https://www.blackpepper.co.uk/blog/blurry-css-animations-in-chrome-try-this

[netil]

@adschm, maybe rendering hint can mitigate this.

• https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/shape-rendering

  .bb-gauge-value {
  shape-rendering: crispEdges
  }