big refactoring and improvement

[yannsucc]

• refactoring folder (more logic i hope)
• improve server/client to permit developer to switch the serializer used
• better Iconnection creation on socket.accept() on server to avoid code duplication. Now you can precise a type of connection on Serveur creation. (first attempt)
• improve FlashServer using the new Iconnection creation. (remove code duplication)
• Some minor refacto on EventManager to explicit Client/server manager used. (try to add some improvement but i remove it from this commit, see 5mixer branches "event_refactor")
• Refactoring of TcpClient/TcpFlashClient
• Manage Connect/disconnect callback on client/server
• Clean some useless/ugly code
• other minor stuff i don't remember :)
• todo : add commentary and refactoring class to standardize typographie (using lower camel case ?)

Tested & working (all localy) :

• neko : server/client
• c++ server/client
• flash : client (connecting to a neko/c++ server)

not tested : websocket protocol

[5Mixer]

Wow, thanks man! Huge amount of work, kudos to you. :+1: