* Add session_t typedef + remove unused functions
u16 peer_id is used everywhere, to be more consistent and permit some evolutions on this type in the future (i'm working on a PoC), uniformize u16 peer_id to SessionId peer_id
* Fix HP transport + some double <-> float problems
TOCLIENT_HP transport u16 hp as a u8, use u16 HP, this prevent HP over 255 to overflow across network
* Fix more double/float problem in serverpackethandler & remove implicit struct type for TileAnimationParams
* Fix connection unittests container
* 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)
* Cleanup network headers
* Move peerhandler to a specific header to reduce compilation times
* Move socket.cpp/h to network folder
* More work
* Network code cleanups
* Move socket.{cpp,h} to network folder
* Move Address object to network/address.{cpp,h}
* Move network exceptions to network/networkexceptions.h
* Client: use unique_ptr for Connection
* Server/ClientIface: use shared_ptr for Connection
* Format fixes
* Remove socket.cpp socket.h from clang-format whitelist
* Also fix NetworkPacket code style & make it under clang-format
