Implement command to change layout from cli

solvable/src/event_handler_main.py

@@ -43,6 +43,14 @@ class TestCommands(TerminalCommands):
                      'shellcmd': f'{seppuku}\n'}
         })
 
+    def command_changelayout(self, *args):
+        message = {'key': 'dashboard',
+                   'data': {'command': 'layout',
+                            'layout': args[0]}}
+        if len(args) >= 2:
+            message['data']['hide_messages'] = (args[1] in ['yes', 'y', '1', 'true'])
+        TFWServerConnector().send(message)
+
 
 if __name__ == '__main__':
     # pylint: disable=invalid-name