Cartesian Image Creation

The cartesian wave creator works, and writes a simple image. This
includes major updates to lots of files.

cartesian_wave: Implemented get value function for calculating the wave
in the plane

polar_wave: Tried to implement, didn't seem to work on first try,
abandoned for now

layer: implemented initialization of basic config file, and rendering
function to sum waves

main: read in basic config file, pixel loop, and write out basic image

vector: better spacing

wave: initialization implemented, corrections to some self variables

debug: new file, used for debug printing via dprint()

pysi.cfg: configuration file, implemented very basic config as of right
now. Variables will have better descriptions later

todo: add method descriptions, better comments, multiple images to gif
loop (with more parameters), polar corrections, etc