GATEIO, Exchange Icon seperation, SVG to Icon font script, Cors for development

Add GATEIO exchange worker
- tested and working, one thing which needs to be fixed is spot/futures, couldnt figure out how to tell aggr which pairs are spot and which ones are futures/perps.
Exchange Icon separation (font-family: exchanges)
- exchange glyph icons and regular icons moved to separate files
SVG to Icon font script ( npm run svg2font )
- use this script to convert exchange icons to glyphs
- converts the SVGs from exchanges/flat to .svg/.scss/.ttf/.woff/.woff2/.eot automatically
- strips the variables from exchanges.scss and appends to the end of the variables.scss
- copies the .svg/.ttf/.woff/.woff2/.eot files to assets/fonts and exchanges.scss to assets/sass
- - might be able to improve this part by adding unique comments before and after so that there won't be any data loss or duplicate data
Cors for development ( npm run cors )
- had an issue when trying to get GATEIO working, the cors.aggr.trade didnt allow connecting to the GATEIO ip.

Tucsky / aggr