feat: Icon component (#1499)

* New icons and old strucure of OHIF ui v1

* Export icon

* Removing wrong import and fixing some exports

* Fixing svg loader and svg images to fullCurrent

* Small fixes on docz

* Remove repeated icon

* Update other components to use Icon

* Update platform/ui/src/components/Icon/icon.mdx

Co-Authored-By: Rodrigo Antinarelli <rodrigoantinarelli@gmail.com>

* Fixing callouts

* Move icons to assets and fixing layout on iconButtons

* Fix path of icons

Co-authored-by: Danny Brown <danny.ri.brown@gmail.com>
Co-authored-by: Rodrigo Antinarelli <rodrigoantinarelli@gmail.com>

platform/ui/package.json

@@ -28,6 +28,7 @@
     "classnames": "^2.2.6",
     "docz": "^2.2.0",
     "gatsby-plugin-postcss": "^2.1.20",
+    "gatsby-plugin-react-svg": "^3.0.0",
     "gatsby-plugin-sass": "^2.1.28",
     "node-sass": "^4.13.1",
     "prop-types": "^15.7.2",