Client & ClientEnvirnment: don't create fake events (#5676)

Client & ClientEnvirnment: don't create fake events (#5676)

Instead of create fake events on the stack on each loop call (Game::run), verify is queue is empty or not and handle event directly if there is.

This prevents fake ClientEvent creation & memory allocations

Same fix is also applied on ClientEnvironment, & rename getClientEvent to getClientEnvEvent to match ClientEnvEvent object