Performance Improvements

[slawlor]

Actors initially were taking an excessive amount of memory for each instance. This is a tracking issue to reduce memory and increase processing time latencies in the actor framework.

Some ideas

• Remove dashmaps from ActorProperties Actors were taking an excessive amount of memory upon creation. #260
• Investigate other fat utilizations in ActorProperties
• Remove monitors (they're kinda useless) in favor of just straight supervision (saves 2 maps) Actors were taking an excessive amount of memory upon creation. #260
• Remove stop notifier being a broadcast sender Changed stop notifier to a Notify More memory improvements, but smaller. No API changes #261

[slawlor]

Moving the bounded channels from mpsc::bounded(1) to oneshot()s seems to be able to save us an additional ~18% in memory and more spawning and message processing performance too. #263