Fixes and new functions. [read the description]

In lots of functions the RPC sending code was incompatible, I fixed them and added some new functions.

New functions:
- setGameModeText
- setMapName
- setWebURL
- setPlayerInterior
- setPlayerCameraPos
- setPlayerCameraLookAt
- setCameraBehindPlayer
- playAudioStreamForPlayer
- stopAudioStreamForPlayer
- sendDeathMessage
- sendDeathMessageForPlayer
- setGravity
- setPlayerGravity