Network cleanup (#6310)

* Move Connection threads to dedicated files + various cleanups

* ConnectionReceiveThread::processPacket now uses function pointer table to route MT packet types
* Various code style fixes

* Code style with clang-format

* Various SharedBuffer copy removal

* SharedBuffer cannot be copied anymore using Buffer
* Fix many SharedBuffer copy (thanks to delete operator)

Author: nerzhul

src/defaultsettings.cpp

@@ -290,7 +290,6 @@ void set_default_settings(Settings *settings)
 	// Network
 	settings->setDefault("enable_ipv6", "true");
 	settings->setDefault("ipv6_server", "false");
-	settings->setDefault("workaround_window_size","5");
 	settings->setDefault("max_packets_per_iteration","1024");
 	settings->setDefault("port", "30000");
 	settings->setDefault("strict_protocol_version_checking", "false");

src/network/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(common_network_SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/address.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/connection.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/connectionthreads.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/networkpacket.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/serverpackethandler.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/serveropcodes.cpp