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Ferrum: based math has arrived

Ferrum is a Rust math library designed to build some very cool math-related functions and projects without relying on other libraries.

In addition to refusing math libraries, I also chose to ignore built-in complex number functionality and the exponentiation operator. Everything here is built from scratch; I like my math completely homemade.

This is a personal project, so I'll be focusing less on speed (although this is indeed Rust), and new stuff will only be added when I feel like adding it.

We have: (so far)

• Complex number and quaternion structs, with + - * / implemented between both these and f32 real numbers

• Polynomial type; includes evaluation, + - *, calculus, and complete complex solving using Newton's method

• The complex exponential function using Taylor series

• The complex natural logarithm using its Taylor series and extensive range-fixing

• Full complex exponentiation and logarithms using both of these

• Trigonometric (and hyperbolic trig) functions using the exponential

• Inverse trigonometric (and inverse hyperbolic trig) funtions using the logarithm and roots

• A constant BASED that's always true

(See the function details and math concepts in doc.md)

(More on the way — find it in todo.md)

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Watch me attempt to use this math to create a calculator with user-input in Titanium, and see a few visual applications for the math at Chromium.