Requesting Ability to Change Time of Quern Grinding via "grindingPropsByType"

[EArkham]

Default time to grind something in a quern appears to be hardcoded to 4 seconds in the BEQuern.cs via maxGrindingTime().

I'd like to request we have access to changing that time inside the "grindingPropsByType" property. 

Something as simple as "grindTime" to set the time exactly, or something like "addGrindTime" for adding more time to the default (I don't suspect there's much point in lowering below 4 seconds).

This would be useful for modders to make some items & blocks take longer, representing a more difficult task, or to encourage automating the quern with a windmill.

Very minor and hopefully easy change to make.

Thanks!