Restructured Test Suite

- separated tests into e2e and unit directories
- created configs directory structure to support test framework
- added/modified `npm run test`, `npm run test:unit` and `npm run test:e2e` to target all, unit and e2e tests respectively
- modified some of the test names to be more descriptive

New structure of the Test Suite has following directory tree:

```
tests
├── configs
│   ├── env.js
│   └── modules
│       ├── clock
│       │   ├── clock_12hr.js
│       │   ├── clock_24hr.js
│       │   └── clock_showPeriodUpper.js
│       └── helloworld
│           └── helloworld.js
├── e2e
│   ├── env_spec.js
│   └── modules
│       ├── clock_spec.js
│       └── helloworld_spec.js
└── unit
    ├── functions
    │   └── cmp_versions_spec.js
    └── global_vars
        └── root_path_spec.js
```

tests/configs/modules/helloworld/helloworld.js

@@ -0,0 +1,32 @@
+/* Magic Mirror Test config sample module hello world
+ *
+ * By Rodrigo Ramírez Norambuena https://rodrigoramirez.com
+ * MIT Licensed.
+ */
+
+var config = {
+	port: 8080,
+	ipWhitelist: ["127.0.0.1", "::ffff:127.0.0.1", "::1"],
+
+	language: "en",
+	timeFormat: 24,
+	units: "metric",
+	electronOptions: {
+		webPreferences: {
+			nodeIntegration: true,
+		},
+	},
+
+	modules: [
+		{
+			module: "helloworld",
+			position: "bottom_bar",
+			config: {
+				text: "Test HelloWorld Module"
+			}
+		}
+	]
+};
+
+/*************** DO NOT EDIT THE LINE BELOW ***************/
+if (typeof module !== "undefined") {module.exports = config;}