* The block form automatically closes the reader and writer if they have
not already been closed. This prevents resource leakage if the method
exits due to an exception.
* Refactor specs to have common setup performed in a before block.
* Nuke around 800 lock
* Honor LSP with not anymore squeezing something non LSP compatible in
the same inheritance tree.
* Separate running from result tree.
* Clean up kill logic and early exits on already dead mutations.
* Fix #runnin? smell for reporters.
* Decouple config object from VM state. Makes it serializable to enable
config loading.
* Fix sequence of global VM events to match PRIOR rspec infects VM with
gazillions of classes / modules. Thix fixes a startup speed
degeneration.
* Various fixes to enhance determinism.
* Replace some unneded manual double dispatch with single manual dispatch for
reporter / runners.
The code looks solid and it does not make too much sense to duplicate
the efford into a better version when I would mostly change the code
style, not the effective sequence / composition of syscalls.
