add library to en/decode HTML entities

Author: haschek

package.json

@@ -87,6 +87,7 @@
         "codemirror": "^6.0.1",
         "color": "^4.2.3",
         "compute-scroll-into-view": "^3.1.1",
+        "he": "^1.2.0",
         "jshint": "^2.13.6",
         "lodash": "^4.17.21",
         "n3": "^1.25.1",
@@ -134,6 +135,7 @@
         "@testing-library/react": "^12.1.5",
         "@types/codemirror": "^5.60.15",
         "@types/color": "^3.0.6",
+        "@types/he": "^1.2.3",
         "@types/jest": "^29.5.14",
         "@types/jshint": "^2.12.4",
         "@types/lodash": "^4.17.16",

yarn.lock

@@ -3079,6 +3079,11 @@
   dependencies:
     "@types/unist" "*"
 
+"@types/he@^1.2.3":
+  version "1.2.3"
+  resolved "https://registry.yarnpkg.com/@types/he/-/he-1.2.3.tgz#c33ca3096f30cbd5d68d78211572de3f9adff75a"
+  integrity sha512-q67/qwlxblDzEDvzHhVkwc1gzVWxaNxeyHUBF4xElrvjL11O+Ytze+1fGpBHlr/H9myiBUaUXNnNPmBHxxfAcA==
+
 "@types/hoist-non-react-statics@^3.3.0":
   version "3.3.6"
   resolved "https://registry.yarnpkg.com/@types/hoist-non-react-statics/-/hoist-non-react-statics-3.3.6.tgz#6bba74383cdab98e8db4e20ce5b4a6b98caed010"