9c77a78 Add new functions to enable/disable a display

Authored and Committed by jjongsma 8 years ago
    Add new functions to enable/disable a display
    
    Previously, there was a single function for controlling the enabled
    state of a display: virt_viewer_display_set_enabled(). Unfortunately,
    this function is used for two slightly different things:
    
     A. It informs the local display widget that the display has become
        disabled or enabled on the server. In other words, it tries to
        synchronize the 'enabled' state of the local widget with the actual
        state of the remote display.
    
    OR
    
     B. It tries to actively enable a currently-disabled display (or vice
        versa) due to some action by the user in the client application.
        This causes the client to send a new configuration down to the
        server. In other words, it tries to change the state of the remote
        display.
    
    There is some conflict between these two scenarios. If the change is due
    to a notification from the server, there is no need to send a new
    configuration back down to the server, so this results in unnecessary
    monitor configuration messages and can in fact cause issues that are a
    little bit hard to track down. Because of this, I decided that it was
    really necessary to have two separate functions for these two different
    scenarios. so the existing _set_enabled() function will be used for
    scenario A mentioned above. I added two new
    functions (_enable() and _disable()) that are used to send new
    configurations down to the server.
    
        
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