Ref T85, minor improvements on server type

* UI: generic generation of combobox
* UI: Read only for combobox
* CServer utility functions

src/blackmisc/network/serverlist.cpp

@@ -9,8 +9,6 @@
 
 #include "blackmisc/network/serverlist.h"
 #include "blackmisc/metaclassprivate.h"
-#include "blackmisc/network/server.h"
-
 #include <tuple>
 
 namespace BlackMisc
@@ -72,6 +70,16 @@ namespace BlackMisc
             }
         }
 
+        CServerList CServerList::findFsdServers() const
+        {
+            CServerList fsdServers;
+            for (const CServer &s : *this)
+            {
+                if (s.isFsdServer()) { fsdServers.push_back(s); }
+            }
+            return fsdServers;
+        }
+
         void CServerList::setFsdSetup(const CFsdSetup &setup)
         {
             for (CServer &s : *this)