Now that our first and last configuration points are 0/100 and 100/0
respectively, we can simplify the calculation a bit. Doubly so because
p2 is just a mirror of p1.
That with extending the slider range to 200 means we get a value for
each integer combination on our pressurecurves - which in turn means
that for any of our generated curves we get a slider value return.
Our previously hardcoded pressurecurves follow a predictable
pattern so we can generate the value on-the-fly based on that pattern.
The slider now uses a range of 100 (integer) values and calculates the
matching pressure curve based on that. The actual pressure curve remains
the same for previous values.
However, the functions are lossy thanks to CLAMP() so figuring out
a slider position from points requires heuristics: for each of the four
coordinates we calculate a slider value. Then we calculate the points
for that slider value and if those calculated points match ours then we
have a winner.
There is now the header-suffix property that makes it possible to add
tablet/stylus icons besides the title/description, so we can simply
use this widget.
