[WIP] Applying best practice#871

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K4PS3 wants to merge 15 commits intoCaliburn-Micro:masterfrom

K4PS3:Applying-Best-Practice

Commits on Oct 6, 2023

Moved files in Caliburn.Micro.Core project.
K4PS3
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Commits on Oct 7, 2023

Commits on Oct 12, 2023

- Fixed a bug (parent is null), I introduced when CodeQL warnings was fixed.
K4PS3
committed

Commits on Oct 14, 2023

- Fixed another bug that I introduced when CodeQL fixed (NullReferenceException, handler is null).
K4PS3
committed