* Correctly set 'shell/open/command; registry key for file associations
* File association fixes
* 'using' statements instead of blocks
* Idempotent unregistration
* Single "hey shell, we changed file associations" notification at the
end instead of 1 for every operation, speeds things up greatly.
* Adapt and fix Linux specific function as well
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Co-authored-by: TSR Berry <20988865+TSRBerry@users.noreply.github.com>
