Split out Preferences-related functions from Termonad.App to Termonad.Preferences #280

Job	Run time
nix simple cabal shell.nix / ubuntu-latest	3m 9s
nix flakes / ubuntu-latest	5m 18s
nix / ubuntu-latest	5m 11s
cabal / ghc-8.10.7 / ubuntu-22.04	4m 1s
cabal / ghc-9.0.2 / ubuntu-22.04	3m 41s
stack --stack-yaml ./stack.yaml / ubuntu-22.04	4m 31s
cabal / ghc-9.2.8 / ubuntu-22.04	3m 44s
stack --stack-yaml ./stack.yaml / ubuntu-20.04	4m 53s
cabal / ghc-9.4.7 / ubuntu-22.04	3m 50s
stack --stack-yaml ./stack-nightly.yaml / ubuntu-22.04	4m 4s
cabal / ghc-8.10.7 / ubuntu-20.04	4m 8s
stack --stack-yaml ./stack-nightly.yaml / ubuntu-20.04	4m 36s
cabal / ghc-9.0.2 / ubuntu-20.04	4m 10s
cabal / ghc-9.2.8 / ubuntu-20.04	3m 52s
cabal / ghc-9.4.7 / ubuntu-20.04	3m 47s
	1h 2m 55s

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