Move NubList and PathTemplate instances to Cabal-QuickCheck

[phadej]

from UnitTests.Distribution.Client.ArbitraryInstances

Also from UnitTests.Distribution.Client.ProjectConfig

• DebugInfoLevel
• HaddockTarget
• InstallDirs
• OptimisationLevel
• PackageDB
• ProfDetailLevel
• TestShowDetails

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UnitTests.Distribution.Solver.Modular.QuickCheck should use Cabal-QuickCheck and

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UnitTests.Distribution.PkgconfigVersion

PkgconfigVersion and PkgconfigVersionRange

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[   0.59072] warning[-Wmodule-with-orphans]: Orphans in UnitTests.Distribution.Compat.Graph (main)
[   0.59182] warning[-Worphans]: instance Arbitrary Graph (from Distribution.Compat.Graph)
[   0.59185] warning[-Wmodule-with-orphans]: Orphans in UnitTests.Distribution.System (main)
[   0.59286] warning[-Worphans]: instance Arbitrary Arch (from Distribution.System)
[   0.59288] warning[-Worphans]: instance Arbitrary OS (from Distribution.System)
[   0.59290] warning[-Worphans]: instance Arbitrary Platform (from Distribution.System)