Preliminary Unit-Testing

- Test User Mentions
- Test User Edit [UserUpdatedEventArgs]
- Test CurrentUser.Edit [UserUpdatedEventArgs]
- Test SetStatus 
- Test SetGame

- Test for Server.GetChannel
- Test for SendTyping [ChannelUserEventArgs]
- Test for EditChannel [ChannelUpdatedEventArgs]
- Test for Channel Mentions
- Test for DownloadMessages with/without cache
- Test for SendTTSMessage

- Test AddGet Permissions
- Test AddRemove Permissions
- Test Permissions triggering ChannelUpdated
- Test HttpException triggered when affecting permissions in an invalid channel.

Environment Vars will be used for storing credentials, to maintain compatibility on the CI.

Test adding Permissions Rules and retrieving Permissions Rules

MessageQueue silently handles all exceptions, cannot test for them.

Test Events for Send/Update/Delete Message
Test Exceptions for:
- Send to a Deleted Channel
- Send to a Channel with No Perms
- Update a Deleted Message

Fixed up existing code for Unit Tests,
Added EventArgs-less AssertEvent,
Added Tests for READY and JoinedServer
Temporarily moved initialization to it's own Test, may leave there?