Change force to be Option<f32> instead of f32 #3240
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Force being 0 having two meanings makes it hard to tell whether it has just been a very light touch or whether no force is provided.
In my drawing app I draw a thick line when pressure is close to 1 or the device has no pressure and a thin line when pressure is close to 0.
Not being able to tell between 0 and None causes bugs where faint strokes suddenly have thick blobs when pressure reaches 0. This could be avoided with some clever logic but the changes in this PR make it a lot easier.
There also is a force variable in
MultiTouchInfobut I don't think that one needs to be changed to Option since it's an average. But I could also update it for consitency.