Async Observer pattern possible future issues

The Message handlers currently support async functions:

.e.g.
https://github.com/JayArrowz/NetScape/blob/12f629d52d2eacf50dab96a16b14f2e211f0319a/NetScape.Modules.FourSevenFour.Game/Messages/Handlers/WelcomeScreenHandler.cs#L22

However if anything modifies the world state in a async manner and is not thread safe it could cause issues.

Anything executed in the message handlers has to be thread safe.

Start with the async handler example in NetScape.Modules.FourSevenFour.Game/Messages/Handlers/WelcomeScreenHandler.cs and trace how message handlers modify world state. The issue does not identify a specific unsafe operation or desired implementation; done would require a defined thread-safety approach and corresponding coverage for async handlers.

Written by the indexing model from the issue text.