FB-115 Change App Url format

[zazabe]

• Extract site / language / version from Url path parts
• Use AppUrl in CM_Request
• Map CM_Response with AppUrl

[zazabe]

@{c7e8ab9c-90bf-4796-bb88-9aa7c8150044,Reto Kaiser} here we are... this is the challenging PR i told you, about https://youtrack.cargomedia.ch/issue/FB-115...

• about Url (AppUrl, PageUrl, etc...): 7bb842c to 2c20991
• about CM_Request / CM_Response: 2c20991 to 44a6739

[njam]

There are some problems with setUrlFromString(), which needs to instantiate a specific type of URL. This is needed so that later the Request::getUrl() can be used to generate correct URLs.
Unfortunately there are way to many dependencies in this area of code (Request, Response, URL, etc), and it's uncertain if it makes sense / is possible to refactor it.

One idea would be to cut the dependencies at CM_Http_Response_Abstract, by ensuring it doesn't receive the Request.

[njam]

Idea:

• Keep single type of Url on Request (Url\Url)
• Move parsing of URL to different place (out of Url) - will provide functionality like Request::popUrlEnvironment()
• Move generating of URLs to different place (out of Url) - will provide functionality like Render::getUrlLayout()