Split out Preferences-related functions from Termonad.App to Termonad.Preferences #279

Job	Run time
cabal / ghc-8.10.7 / ubuntu-22.04	25m 35s
cabal / ghc-9.0.2 / ubuntu-22.04	34m 21s
cabal / ghc-9.2.8 / ubuntu-22.04	30m 19s
nix flakes / ubuntu-latest	7m 12s
nix / ubuntu-latest	5m 12s
nix simple cabal shell.nix / ubuntu-latest	31m 7s
cabal / ghc-9.4.7 / ubuntu-22.04	30m 59s
cabal / ghc-8.10.7 / ubuntu-20.04	25m 42s
stack --stack-yaml ./stack.yaml / ubuntu-22.04	26m 5s
cabal / ghc-9.0.2 / ubuntu-20.04	37m 47s
stack --stack-yaml ./stack.yaml / ubuntu-20.04	4m 56s
cabal / ghc-9.2.8 / ubuntu-20.04	26m 29s
stack --stack-yaml ./stack-nightly.yaml / ubuntu-22.04	32m 59s
cabal / ghc-9.4.7 / ubuntu-20.04	25m 52s
stack --stack-yaml ./stack-nightly.yaml / ubuntu-20.04	27m 56s
	6h 12m 31s

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