[Feature][#139] Add an image or icon to the navbar

Adding a navbar icon, option to change displayed name in navbar from $wgSitename, and cleaning up formatting of code.

### Information about this PR

This PR enables an icon image to be displayed in the title bar using $wgLogo, left of the wiki's set site name(`$wgSitename`).  See Feature #139.
* The image will downsize to an attempted 16:9 setting if larger than 64px wide x 36px height but maintain aspect ratio of image. 
* Set your image with the standard `$wgLogo` in `LocalSettings.php`
* Option to shorten displayed `$wgSitename`

To shorten the sitename, add `'wikiName' =>'Site Title To Show'` to the `$wgForegroundFeatures = array(` setting the Site Title To Show to your preferred title.

If you are not using the `$wgForegroundFeatures = array(` then add the below

```
require_once "$IP/skins/foreground/foreground.php";
```

### Example
```
require_once "$IP/skins/foreground/foreground.php";
$wgForegroundFeatures = array(
			'wikiName' =>'Site Title To Show'
);
```

### Adjusting Width of Title Area

This is the common setting of the title area.

```
.top-bar .name h1 a {
padding: 0 15px;
}
```

You can gain more horizontal space with an addition of CSS in `MediaWiki:Common.css` or `MediaWiki:Foreground.css`. Example, gain 20px more of horizontal space.

```
.top-bar .name h1 a {
padding: 0 5px;
}
```

You can also hide the title or the image based on screen size with additional CSS.