Multi monitor support

See also #6 (closed) and #323 (closed)

Windows server support

• Only in full scren

WINDOWS 2003 till WINDOWS 2008 (XP, Vista)

• Only using span. One big bitmap for all monitors
• Going out of fullscreen we still have a huge bitmap as the server cannot be reconfigured.
• Removing a montor is not possible, we will have a window with the huge bitmap.
• As conswquence we can go back to fullscreen with any impact.

WINDOWS 2008R2, WINDOWS 2012 (Win7, Win8)

• First basic, real multi monitor support, the server is aware of each monitor and places the windows correctly.
• Yet, it doesn't support the configuration change awareness.
• Same behaviors as above.

WINDOWS 2012R2, WINDOWS 2016 (Win 8.1, Win 10) and forward

"Display Control Virtual Channel Extension" has been implemented, https://msdn.microsoft.com/en-us/library/dn366738.aspx

Every time we add qand remove a monitor, the remote server adapt its configuration.

FreeRDP

• FreeRDP/client/common/client.c

/* Moved logic for Multimon and Span monitors to force fullscreen, so
 * that the rdp file also triggers this functionality */             
if (settings->SpanMonitors)                                          
{                                                                    
    settings->UseMultimon = TRUE;                                
    settings->Fullscreen = TRUE;                                 
}                                                                    
else if (settings->UseMultimon)                                      
{                                                                    
    settings->Fullscreen = TRUE;                                 
}