Create player class

[Fidge123]

• [x] controls/knows camera
• [x] knows his train
• [x] AbstractPlayer, LocalPlayer, RemotePlayer and AiPlayer

Eventhandler sends Events to player and gets reference to camera through player.

m_game->playerTrain()->wagonAt(m_lockedWagonIndex)->primaryActionDebug(); changes to m_player->primaryActionDebug(); while player knows lockedWagonIndex and aim vector