Support 8 bit and 16 bit floating point formats

Discussed in https://github.com/logisim-evolution/logisim-evolution/discussions/1608

Originally posted by juancolonna December 14, 2022 Dear developers, first I'd like to thank you for the amazing work you are doing developing Logisim. Second, I would like to request a new feature if possible.

I use Logisim as a teaching tool with my students. I usually explain initial concepts using 8-bit logic, in a simple way. I often using minifloat (8-bit float) to explain floating number concepts (scale, overflow, etc.). Floating arithmetic blocks don't have the 8-bit option, eg: addition, multiplication, subtraction, etc., and for me it would be very useful. Would it be possible to implement 8-bit float operations? I would be very grateful.

At,