adding houdini properties to inheritance data

[chrisdavidmills]

As per #302

A couple of points — in the issue, CSSMathValue and CSSUnitValue are both listed in two places. I've not included the second instance, in both cases. @jpmedley , let me know if that's correct. Thanks!

[jpmedley]

Good catch! I've updated the ticket to indicate which of the duplicates are errors.

[chrisdavidmills]

Thanks @jpmedley ; I've fixed the inheritance of CSSUnitValue.

[Elchi3]

Same here, the file that MDN uses, is actually https://github.com/mdn/kumascript/blob/master/macros/InterfaceData.json So, if you expect something on MDN (sidebars) to be changed, change it on KumaScript.

[chrisdavidmills]

@Elchi3 I have opened a new PR to put this data in the right place: mdn/kumascript#907

Not sure if we want to add these in both places, or I can just close the old PRs now?

[ExE-Boss]

LGTM, r+

Also, we probably want to add them to both repositories, given that the API sidebars will eventually be migrated to use this repository too (see #342).

[chrisdavidmills]

I'll merge this for now, just to clear it out of the queue if for no other reason.