Add ctor/dtor tests to MPSC queue

Now also testing that resources are properly moved and/or bitwise
copied inside of the MPSC queue. To make this possible the Resource
testing struct was moved outside of the store::component::tests
module.

Implement MPSC queue

Multiple producer, single consumer queue with the purpose of acting
as the inbox for components.

WIP: Work on MPSC queue, pending bugfixes

Works in single threaded fashion, some issues in multithreaded
stresstest require fixing.

WIP: Busy with MPSC channel

Will act as backing buffer for messages (for now).