feat: add ico--wheelchair

scripts/update-iconset.js

source/_patterns/00-atoms/02-icons/icons.mustache

source/css/atoms/icons.pcss

source/icons/demo-files/demo.css

source/icons/demo.html

source/icons/fonts/pirati-ui.eot

source/icons/fonts/pirati-ui.svg

source/icons/fonts/pirati-ui.ttf

source/icons/fonts/pirati-ui.woff

source/icons/selection.json

source/icons/style.css

source/icons/style.scss

source/icons/variables.scss