[xwiki-notifications] [Issue] Created: (XWATCH-83) Implement an model-based and event based refresh mechanism for XWiki Watch ui

[Anca Paula Luca (JIRA)]

Implement an model-based and event based refresh mechanism for XWiki Watch ui
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                 Key: XWATCH-83
                 URL: http://jira.xwiki.org/jira/browse/XWATCH-83
             Project: XWiki Watch
          Issue Type: Task
          Components: Other
    Affects Versions: 1.0M2
            Reporter: Anca Paula Luca


The current mechanism of getting data from the wiki and displaying it in the feed reader interface should be replaced with a new one that would meet the following requirements:
- allow a model based user interface: right now, some widgets are extracting their own data in from the wiki and only display it, without storing it in a model. The advantages of a model based approach would be the deletion of all DataManager calls in the ui and the possibility of optimized interface updates based on old data and newly fetched one
- in the current implementation, there is high coupling between widgets and the controller (Watch): the controller refreshes widgets and widgets refresh each other on various changes of the data. We need an event based mechanism: the controller published data changes events and the widgets subscribe to these events and update accordingly. 
- there are various places in the code where data or ui refresh is requested, other than the controller and there should be none.

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