[Cin] Plugins in integer or in float

[Andrea paz]

>From the source code we can tell if a plugin works in 32 bit float or
8/10 bit integer?
I don't know, maybe by searching for the string "float" in the code or
something like that? Or the normalized range (0-1.0) instead of the
range (0-255), etc.
It would be important to put this information in the manual because,
for example, I know that Histogram works with integers and this can
lead to clipping (with loss of information) in highlights or deep
blacks. In contrast, Blue Banana works in floats.