Bootstrapping complete

Finally have the basic bootstrapping done. Illustrator launches when
opening the script because I set all .jsx files to open with ai

Ai doesn't support some basic js functions like .forEach or .contains

Wrote my own forEach function that calls a callback with the arary
item and the array index

So now the code is much cleaner as I loop through the artboards and call
the genSpriteSheet method.

Finally the script loops through generating .png files for each artboard

If the artboard name is just "* Artboard *" it is replaced with the doc
name + _ab(index). And all sprite sheet artboards contain their matching
artboard name + the suffix _SS.

The generated PNG files are clipped to their respective artboards and
given their artboard's name.

Right now there's nothing keeping artboards from overlapping

Next step is to make the genSpriteSheet actually do something instead of
just making a new artboard.