Implement Float Manipulation Module

[Rinzii]

The float manipulation module currently has the following functions that need implementation or work done.

TODO:

Implement:

• copysign
• frexp
• ilogb
• ldexp
• logb
• modf
• nextafter
• scalbn

Document:

• copysign
• frexp
• ilogb
• ldexp
• logb
• modf
• nextafter
• scalbn

NOTES:

None currently.