Z-SAMPA added & conversion plugin style for x2i

Also made everything comply with standard js

if you want to add a conversion, add your key (provided it doesn't conflict with p, x, or z) and add a link to the json file and what the output should look like, following the format already given in x2i.

the json file format is an array of find & replace pairs, which is executed in order. the keys should be longest to shortest in length for full accuracy.