Remove duplicate xml escaping

We used to write the user string directly into the svg string, but now we are setting the `.textContent` of an actual dom node, which does the escaping for us.

package.json

@@ -51,7 +51,6 @@
     "uglifyjs-webpack-plugin": "^1.2.5",
     "webpack": "^4.8.0",
     "webpack-cli": "^2.0.15",
-    "webpack-dev-server": "^3.1.4",
-    "xml-escape": "1.1.0"
+    "webpack-dev-server": "^3.1.4"
   }
 }

src/util/svg-text-wrapper.js

@@ -1,5 +1,4 @@
 const TextWrapper = require('./text-wrapper');
-const xmlescape = require('xml-escape');
 
 /**
  * Measure text by using a hidden SVG attached to the DOM.
@@ -118,7 +117,7 @@ class SVGTextWrapper extends TextWrapper {
             const tspanNode = document.createElementNS('http://www.w3.org/2000/svg', 'tspan');
             tspanNode.setAttribute('x', '0');
             tspanNode.setAttribute('dy', '1.2em');
-            tspanNode.textContent = xmlescape(line);
+            tspanNode.textContent = line;
             textElement.appendChild(tspanNode);
         }
         return textElement;