This allows pages to be to redirect any url, anywhere, even when not
in a page context.

identifiers by a custom scheme and rename 'pages' scheme to 'page'

The callback is defined is as follows: 'function($route, $generate = false)'

- $route: a ComPagesDispatcherRouteRouteInterface object
- $generate: are we generating a url or resolving (default false)

Callbacks are both supported for static and dynamic routes, in case of a
dynamic route the callback is called only if the route could be succesfully
resolved.

Example:

'/path/to/page' => [
	'generate' => function($route)
	{
		return true;
	},
	'resolve' => function($route)
	{
		return true;
	}
],

A file route is absolute if the path of the route is a fully qualified file path

Add support for the 'force-download' query parameter. If specified the
file will be downloaded instead of allowing the browser to preview the
file if it can do so.

For example:

'files/[:name]' => '/files/documents/[:name].pdf?force-download'

The `transport`query parameter allows to define which transport. At the
moment two additional transports are supported: `stream` and `sendfile

cache query parameter

The cache query parameter allows to define the max-age in
seconds.