fix: Activate default controller

Chapter 6.6.6 of the OSC1 Standard defines the expected activation behavior for the default controller: https://www.asam.net/index.php?eID=dumpFile&t=f&f=4908&token=ae9d9b44ab9257e817072a653b5d5e98ee0babf8#_controllers

• This MR activates the default controller right after its creation
• it also activates the external host controller which can be configured via override right after its creation because in the scenario the external host controller is neither defined nor activated
• This commit also reorders ControllerCreator class member variables to fix warnings.