Cleanup of non-namespaced typenames and headers

[dennisklein]

• In the beginning FairMQ was a sub-component of FairRoot and so inherited its naming scheme in the global namespace (typenames ::FairMQ* and headers <FairMQ*.h>).
• After FairMQ was split into a separate repo we introduced new typenames in ::fair::mq as well as headers in <fairmq/*.h>. Older names still remained non-namespaced.
• Since FairMQ v1.4.41 (~September 2021) this inconsistency was cleaned up. Namespaced typenames and header files were added also for the old names.

Deprecation announcement: In one of the future releases the old names/headers will be deprecated (e.g. v1.5) and eventually removed (e.g. earliest v1.6, if deprecated in v1.5)! Please modernize:

	old/deprecated	new	examples
Typenames	::FairMQ*	::fair::mq	FairMQDevice becomes fair::mq::Device
Headers	<FairMQ*.h>	<fairmq/*.h>	#include <FairMQDevice.h> becomes #include <fairmq/Device.h>

Preview: #425, specifically 7b5b565 and ede5812 (see following posts for more human readable form of those changes)

[dennisklein]

Soon to be deprecated typenames (likely in v1.5):

old/deprecated	new
::fair::mq::FairMQMemoryResource	!!! ::fair::mq::MemoryResource
::fairmq_free_fn	!!! ::fair::mq::FreeFn
::InputMsgCallback	!!! ::fair::mq::InputMsgCallback
::InputMultipartCallback	!!! ::fair::mq::InputMultipartCallback
::FairMQMessage	::fair::mq::Message
::FairMQMessagePtr	::fair::mq::MessagePtr
::FairMQParts	::fair::mq::Parts
::FairMQPoller	::fair::mq::Poller
::FairMQPollerPtr	::fair::mq::PollerPtr
::FairMQProgOptions	::fair::mq::ProgOptions
::FairMQChannel	::fair::mq::Channel
::FairMQSocket	::fair::mq::Socket
::FairMQSocketPtr	::fair::mq::SocketPtr
::FairMQTransportFactory	::fair::mq::TransportFactory
::FairMQTransportFactoryError	::fair::mq::TransportFactoryError
::FairMQRegionEvent	::fair::mq::RegionEvent
::FairMQRegionInfo	::fair::mq::RegionInfo
::FairMQRegionBlock	::fair::mq::RegionBlock
::FairMQRegionCallback	::fair::mq::RegionCallback
::FairMQRegionBulkCallback	::fair::mq::RegionBulkCallback
::FairMQRegionEventCallback	::fair::mq::RegionEventCallback
::FairMQUnmanagedRegion	::fair::mq::UnmanagedRegion
::FairMQUnmanagedRegionPtr	::fair::mq::UnmanagedRegionPtr
::FairMQRegionConfig	::fair::mq::RegionConfig
::FairMQChannelMap	::fair::mq::ChannelMap
::FairMQDevice	::fair::mq::Device

!!!: marks irregular change

[dennisklein]

Soon to be deprecated header files (likely in v1.5):

old/deprecated	new
options/FairMQProgOptions.h	!!! <fairmq/ProgOptions.h>
FairMQLogger.h	!!! <fairlogger/Logger.h>
FairMQChannel.h	<fairmq/Channel.h>
FairMQDevice.h	<fairmq/Device.h>
FairMQMessage.h	<fairmq/Message.h>
FairMQParts.h	<fairmq/Parts.h>
FairMQPoller.h	<fairmq/Poller.h>
FairMQSocket.h	<fairmq/Socket.h>
FairMQTransportFactory.h	<fairmq/TransportFactory.h>
FairMQUnmanagedRegion.h	<fairmq/UnmanagedRegion.h>

not going to be deprecated	make sure to #include with fairmq/prefix!
runFairMQDevice.h	<fairmq/runFairMQDevice.h> (Note there is also a newer <fairmq/runDevice.h> with more modern signature for the getDevice() function)

!!!: marks irregular change