Add Before and After Start and Stop Server EventsHandlers

[scottoffen]

Desired Result

public delegate void ServerEventHandler(IRestServer server);

ServerEventHandler handler = restServer => { /* do something here */ };

server.BeforeStart += handler ;
server.AfterStart += handler ;
server.BeforeStop += handler ;
server.AfterStop += handler ;

• deprecate OnBeforeStart, OnAfterStart, OnBeforeStop and OnAfterStop
• delegate must take an IRestServer instance as an argument
• delegates for all handlers are invoked in the order they are added
• exceptions throw by delegates will be re-thrown in an AggregateException
• nothing else executes prior to the Before* delegates being invoked
• After* delegates will not be invoked if exceptions are encountered
• update ServerSettings with delegates
• clone delegates between IServerSettings and IRestServer