Refactor found_files and found_registry to HashMap instead of HashSet… #921

Job	Run time
lint (windows-latest)	3m 31s
build (windows-latest, x86_64-pc-windows-msvc, win64, ludusavi.exe, false)	6m 59s
lint (ubuntu-latest)	28s
build (windows-latest, i686-pc-windows-msvc, win32, ludusavi.exe, false)	5m 53s
build (ubuntu-20.04, x86_64-unknown-linux-gnu, linux, ludusavi, true)	2m 32s
test (windows-latest)	2m 26s
build (macos-12, x86_64-apple-darwin, mac, ludusavi, true)	3m 10s
test (ubuntu-latest)	1m 6s
test (macos-latest)	52s
	26m 57s

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