2-dimensional wavetable

[potrepka]

It would be nice to have a table oscillator that takes an array of wavetables, which we can traverse in two dimensions:

1. We can control the phase of the table with a parameter called phase.
2. We can modulate across tables with a second parameter called position.

Both parameters would range from 0 to 1. The function definition would be:

el.table2([props], phase, position)

The props would be:

Name	Default	Type	Description
paths	[]	Array	The names of sample buffers in the VFS