Enhancement: Support multiple news 'view' layouts

[CaMer0n]

The admin may choose from a selection of news 'view' templates when editing news items.
Theme developers may add multiple news 'view' templates to their themes.

If you have ideas for different Bootstrap3 news layouts, please comment below.
Ideas:

• template for video news items
• template for slideshow image news items

[CaMer0n]

Note: the commit requires a database update.

[CaMer0n]

See e107_plugins/news/templates/news_view_template.php

$NEWS_VIEW_INFO = array(

	'default' 	=> array('title' => LAN_DEFAULT, 							'description' => 'unused'),
	'videos' 	=> array('title' => "Videos (experimental)", 							'description' => 'unused'),
);