Update state machine

- Split INITIALIZING state into Init+Bind+Connect
 - Remove PAUSE state
 - Convert state/transitions to enum classes (CamelCase)
 - Transition to a state only once previous handler is complete
 - Add CompleteInit transition to notify Initializing state
   that config updates are complete
 - Deprecate WaitForEndOfState(transition) in favor of
   WaitForState(state)/WaitForNextState()
 - Update tests/plugins to new APIs
 - Deprecate CheckCurrentState() in favor of NewStatePending()

fairmq/CMakeLists.txt

@@ -50,7 +50,7 @@ set(FAIRMQ_PUBLIC_HEADER_FILES
   FairMQPoller.h
   FairMQUnmanagedRegion.h
   FairMQSocket.h
-  FairMQStateMachine.h
+  StateMachine.h
   FairMQTransportFactory.h
   MemoryResources.h
   MemoryResourceTools.h
@@ -83,7 +83,6 @@ set(FAIRMQ_PRIVATE_HEADER_FILES
   options/FairProgOptionsHelper.h
   plugins/Builtin.h
   plugins/Control.h
-  StateMachine.h
   shmem/FairMQMessageSHM.h
   shmem/FairMQPollerSHM.h
   shmem/FairMQUnmanagedRegionSHM.h
@@ -130,7 +129,7 @@ set(FAIRMQ_SOURCE_FILES
   FairMQMessage.cxx
   FairMQPoller.cxx
   FairMQSocket.cxx
-  FairMQStateMachine.cxx
+  StateMachine.cxx
   FairMQTransportFactory.cxx
   devices/FairMQBenchmarkSampler.cxx
   devices/FairMQMerger.cxx
@@ -144,7 +143,6 @@ set(FAIRMQ_SOURCE_FILES
   PluginManager.cxx
   PluginServices.cxx
   plugins/Control.cxx
-  StateMachine.cxx
   shmem/FairMQMessageSHM.cxx
   shmem/FairMQPollerSHM.cxx
   shmem/FairMQUnmanagedRegionSHM.cxx