[5.4.0] Update eslint target to 2017 and do initial fixes (#9135)

* eslint manual fixes
- update eslint to 2017
- add self to forbidden globals
- fix a few unfixable bugs caught by eslint
- convert newer features in twitter-archivist

* add eslint plugin to forbid features

* import changes from @saqimtiaz

* add package.json changes

plugins/tiddlywiki/xlsx-utils/importer.js

@@ -144,7 +144,7 @@ XLSXImporter.prototype.processField = function(fieldImportSpecTitle) {
 							value = cell.v.toString();
 							break;
 						case "string":
-							// Intentional fall-through
+							// falls through
 						default:
 							value = cell.w;
 							break;