Convert and remove PacketAPI

[ethanmoffat]

This is a general task for converting code from the PacketAPI object and PacketAPICallbackManager object into the new design paradigm.

PacketAPI calls will generally be replaced with Actions that use the PacketSendService to send a packet to the server.

PacketAPICallbackManager event handling will generally be replaced with an IPacketHandler in EOLib.PacketHandlers (more logic is usually required).

This issue has dependencies on just about everything else, so I'm using it to track work that is done in converting the code from Old->New that doesn't really fall under a larger feature.