Float point support for functional simulation

[ryukzak]

Docs:

1. Function implementations: https://github.com/ryukzak/nitta/blob/master/src/NITTA/Intermediate/Functions.hs
2. Simulation implementation: https://github.com/ryukzak/nitta/blob/master/src/NITTA/Intermediate/Simulation.hs

How we can start it:

1. Write your own test for functional simulation: https://github.com/ryukzak/nitta/blob/master/test/NITTA/Intermediate/Simulation/Tests.hs
2. Try to add test for float type (instance for Fractional a) with simple algorithm.
3. Add function definition for float point division.
4. Use it inside function simulation test.