Linter update (#1777)

* Update eslint config

* Applied linter to lib

* Applied eslint config to CliClient/app

* Removed prettier due to https://github.com/prettier/prettier/pull/4765

* First pass on test units

* Applied linter config to test units

* Applied eslint config to clipper

* Applied to plugin dir

* Applied to root of ElectronClient

* Applied on RN root

* Applied on CLI root

* Applied on Clipper root

* Applied config to tools

* test hook

* test hook

* test hook

* Added pre-commit hook

* Applied rule no-trailing-spaces

* Make sure root packages are installed when installing sub-dir

* Added doc

ReactNativeClient/lib/services/InteropService_Exporter_Md.js

@@ -29,7 +29,6 @@ class InteropService_Exporter_Md extends InteropService_Exporter_Base {
 			if (!item.parent_id) return output;
 			item = await Folder.load(item.parent_id);
 		}
-		return output;
 	}
 
 	async replaceResourceIdsByRelativePaths_(item) {