Multiple wave functions should be supported beyond just Sine wave

[mlindner]

Suggested supported waves:

• [ ] Sine Wave
• [ ] Square wave
• [ ] Triangle wave
• [ ] Sawtooth wave

[mlindner]

A suggested way of implementing them is have a base type that simply passes a value from [0 2pi) to a supplied "wave function" that can be anything from a mathematical function to a discrete lookup table, then users can implement their own additional Wave functions as they see fit.