Modules renaming (#13009)

New batch of renaming:

GHC.Settings <= main/Settings.hs, main/FileSettings.hs, main/ToolSettings.hs, main/GhcNameVersion.hs, main/PlatformConstants.hs
GHC.Settings.Constants <= main/Constants.hs
GHC.Settings.IO <= main/SysTools/Settings.hs

in ghc-boot:
GHC.Settings.{Platform,Utils} <= GHC.Settings

GHC.Parser <= parse/Parser.y
GHC.Parser.Annotation <= parser/ApiAnnotation.hs
GHC.Parser.CharClass <= parser/Ctype.hs
GHC.Parser.Lexer <= parse/Lexer.x
GHC.Parser.Header <= main/HeaderInfo.hs
GHC.Parser.PostProcess <= parser/RdrHsSyn.hs
GHC.Parser.PostProcess.Haddock <= parser/HaddockUtils

GHC.SysTools.BaseDir <= main/SysTools/BaseDir.hs
GHC.SysTools.ExtraObj <= main/SysTools/ExtraObj.hs
GHC.SysTools <= main/SysTools.hs
GHC.SysTools.Info <= main/SysTools/Info.hs
GHC.SysTools.Process <= main/SysTools/Process.hs
GHC.SysTools.Tasks <= main/SysTools/Tasks.hs
GHC.SysTools.Terminal <= main/SysTools/Terminal.hs
GHC.SysTools.Ar <= main/Ar.hs
GHC.SysTools.Elf <= main/Elf.hs
GHC.SysTools.FileCleanup <= main/FileCleanup.hs

GHC.Builtin.Uniques <= prelude/KnownUniques.hs
GHC.Builtin.Utils <= prelude/PrelInfo.hs
GHC.Builtin.Names <= prelude/PrelNames.hs
GHC.Builtin.Names.TH <= prelude/THNames.hs
GHC.Builtin.PrimOps <= prelude/PrimOp.hs
GHC.Builtin.Types <= prelude/TysWiredIn.hs
GHC.Builtin.Types.Literals <= typecheck/TcTypeNats.hs
GHC.Builtin.Types.Prim <= prelude/TysPrim.hs

GHC.Iface.Recomp.Binary <= iface/BinFingerprint.hs
GHC.Iface.Recomp.Flags <= iface/FlagChecker.hs

GHC.Core.Op                  => GHC.Core.Opt
GHC.Core.Opt.Simplify.Driver => GHC.Core.Opt.Driver
GHC.Core.Opt.Tidy            => GHC.Core.Tidy
GHC.Core.Opt.WorkWrap.Lib    => GHC.Core.Opt.WorkWrap.Utils