Fix #283 and more:

* Might have fixed death window issue but not confirmed
* Stop hotkey window from display while offline
* Moved some required features to >= 840 if statement
  (protocol 840/842 arent supported in otclient yet)

modules/game_hotkeys/hotkeys_manager.lua

@@ -109,6 +109,9 @@ function offline()
 end
 
 function show()
+  if not g_game.isOnline() then
+    return
+  end
   hotkeysWindow:show()
   hotkeysWindow:raise()
   hotkeysWindow:focus()
@@ -190,7 +193,6 @@ function save()
   local hotkeys = hotkeySettings
 
   if perServer then
-    hotkeys[G.host] = {}
     hotkeys = hotkeys[G.host]
   end
 
@@ -210,6 +212,8 @@ function save()
     }
   end
 
+  table.dump(hotkeys)
+
   hotkeyList = hotkeys
   g_settings.setNode('game_hotkeys', hotkeySettings)
   g_settings.save()