Template validation allows game objects with same name as game

[mnuck]

The attached creer.yaml (which has a .txt suffix so github will let me upload) passes template validation and creates clients. The c++ client fails to build:

In file included from /home/mnuck/rebot/Cadre/Joueur.cpp/games/botnet/ai.hpp:4:0,
                 from /home/mnuck/rebot/Cadre/Joueur.cpp/games/botnet/ai.cpp:4:
/home/mnuck/rebot/Cadre/Joueur.cpp/games/botnet/impl/botnet.hpp:23:7: error: using typedef-name ‘using Botnet = class std::shared_ptr<cpp_client::botnet::Botnet_>’ after ‘class’
 class Botnet : public Game_
       ^
In file included from /home/mnuck/rebot/Cadre/Joueur.cpp/games/botnet/impl/../game.hpp:22:0,
                 from /home/mnuck/rebot/Cadre/Joueur.cpp/games/botnet/impl/botnet.hpp:13,
                 from /home/mnuck/rebot/Cadre/Joueur.cpp/games/botnet/ai.hpp:4,
                 from /home/mnuck/rebot/Cadre/Joueur.cpp/games/botnet/ai.cpp:4:
/home/mnuck/rebot/Cadre/Joueur.cpp/games/botnet/impl/../impl/botnet_fwd.hpp:19:40: note: ‘using Botnet = class std::shared_ptr<cpp_client::botnet::Botnet_>’ has a previous declaration here
 using Botnet = std::shared_ptr<Botnet_>;

I suspect the issue is that the game is named "Botnet" and so is the in-game object.

As a creer.yaml author, I want to be blocked from instantiating clients that will not compile. Suggest an explicit check for same name.