Fixed spelling

Fixed sbyte writing

Removed conditional compile for installer

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