Add SVG icon support

app/soapbox/components/svg_icon.js

@@ -0,0 +1,29 @@
+/**
+ * SvgIcon: abstact component to render SVG icons.
+ * @module soapbox/components/svg_icon
+ * @see soapbox/components/icon
+ */
+
+import React from 'react';
+import PropTypes from 'prop-types';
+import classNames from 'classnames';
+import InlineSVG from 'react-inlinesvg';
+
+export default class SvgIcon extends React.PureComponent {
+
+  static propTypes = {
+    src: PropTypes.string.isRequired,
+    className: PropTypes.string,
+  };
+
+  render() {
+    const { src, className } = this.props;
+
+    return (
+      <div className={classNames('svg-icon', className)}>
+        <InlineSVG src={src} />
+      </div>
+    );
+  }
+
+}