Refactored client

[PierreMarguerie]

Issues closed

this PR closes already closed issues

Summary

Basically changed the whole client architecture.

Changes

The client is now an app featuring a thread safe queue to treat the network input, the network output is treated by a system and a service(encapsulating the queue) to pass in the system contructors.

Breaking changes

• This code contains breaking changes:

Since IO and Game are not running in the same thread, IO callbacks need to push a function to an actionQueue (thread-safe) that the main thread will pop and execute to avoid concurrency.
Here's how to use this queue (packet spawn for example):

using Callback = std::function<void(HandlerToolbox&)>; // You will find this definition in app.hpp
void handleSpawn(Spawn packet, client::HandlerToolbox& toolbox);

Inside the "registerAllCallbacks" method:

_client.getPacketDispatcher().bind<packet::Spawn>([this] // pass the object in the context of the first lambda
        (const SessionPtr&, const packet::Spawn& packet) // then this in the parameters (standard for a callback)
        {
            _actions.push([packet] // pass the packet to the context of the second lambda
                (HandlerToolbox& tb)
                {
                     packet::handler::handleSpawn(p, tb); // Finally call the "real" handler function
                });
        });

It will then be called like this:

    Callback action;
    while (_actions.pop(action)) {
            action(_toolbox);
    }

Additional Notes

For additional explication about the usage of the different classes, man wiki.