New design: facade/controller, etc

[AnthonyAkentiev]

From Slack:

contract API {
    function addUserToGroup(string _group, address _user){
        engine.do("addUserToGroup", [engine.c(_group), engine.c(_user)])
    }
}

contract Engine {
    function do(string _func, bytes32[] _params){
        libController.do(_func, _params);
    }
}

contract LibController {
    function do(string _func, bytes32[] _params){
        FuncData funcData = engine.get(_func);

        funcData.libAdrress
        .call() ....
    }
}

contract DaoBase {
    function addUserToGroup(string _group, address _user){}
}