Removed C# >4.0 features

Added safety checks to not send garbage bits

Added encryption and channel overloads to all send methods

Added better header safety, public key-grab API and fixed NetworkConf…

…ig bit issue

Upgraded protocol version constant to 3.0.0

Fixed UnityAsset importing in installer

Updated MLAPI version to 2.1.0

Fixed write issue in NetworkedTransform

Updated Installer

Update README.md