Add NoVnc keyboard (#13)

* novnc wip.

* remove blacklistKeys.

* eslint ignore all js files.

* ad common keyboard interface.

* upgrade novnc.

* fix novnc.

* fix novnc keyboard.

* fix keyboard remapping.

* conditionally include novnc at build time.

.eslintrc

@@ -14,5 +14,6 @@
     "no-dupe-class-members": "off",
     "no-console": "off",
     "no-empty": "off"
-  }
+  },
+  "ignorePatterns": ["**/*.js"]
 }