MountRequiredRegistryHives and SetupProvider functions in MSFT_xRegistryResource

[ArieHein]

Please swap to using Switch statements instead of If statements.
Its a bad progrmming practice and wasting time re-evaluating strings when its not needed.

same with $KeyName.Value.ToString(). Just set it ouside the logic section and then call it and manipulate it inside.

Updated: yes i know i can fork the repo and change the code myself and then ask for a pull request, i just dont have the capactiy to do that atm :(

[kwirkykat]

This resource (including the bad code) will get updated as part of #160