States of the engine

The engine can be in different states.

1. Is the engine running (=Server or Client started)? -> htme_isStarted returns true
2. Are we running the server? -> htme_isServer returns true
3. (Only client) -> Is the client connected to a server? -> htme_clientIsConnected returns true
4. (Only client) -> Did a connection to the server fail? -> htme_clientConnectionFailed returns true