Answers waste chances; shorter/longer commands

- Answering now wastes the game's chances: this is to avoid people trying to be funny, and to have games last shorter since answers also give people more clues.
- Longer guess/answer commands: To avoid messing up the two; /a and /g were kept for preference.
- /hadmins used instead of /hangmanauth for practicality.
- Answer length set to 4 minimum (since the hangword's minimum length is so)
- /hadmins advice added to /help