add the possibility to delete LVL1Controllers (deletion may be impossible for...

add the possibility to delete LVL1Controllers (deletion may be impossible for some controllers. e.g.: controllers used by the kinematic unit)
extend the gui to be able to delete controllers
extended the RobotUnitListener to carry this information (lvl1ControllerDeleted)
extended LVL1ControllerDescription to carry this information
add LVL1ControllerInterface isDeletable and deleteController

rename RobotUnitInterface switchControllerSetup to switchLVL1ControllerSetup (to keep the naming scheme)
rename RobotUnitInterface activateController to activateLVL1Controller (to keep the naming scheme)
rename RobotUnitInterface activateControllers to activateLVL1Controllers (to keep the naming scheme)
rename RobotUnitInterface deactivateController to deactivateLVL1Controller (to keep the naming scheme)
rename RobotUnitInterface deactivateControllers to deactivateLVL1Controllers (to keep the naming scheme)
rename RobotUnitInterface createController to createLVL1Controller (to keep the naming scheme)
rename RobotUnitInterface createControllerFromVariantConfig to createLVL1ControllerFromVariantConfig (to keep the naming scheme)

rename RobotUnitListener lvl1ControllerAdded to lvl1ControllerCreated (now the method createLVL1Controller triggers lvl1Controller created instead of lvl1ControllerAdded)