UpdateSubmodules as bool? and ConfirmationPage
UICommands.UpdateSubmodules on CheckoutBranch, CheckoutRevision, CreateBranch and ResetCurrentBranch
fix ConfirmUpdateSubmodules
ConfirmationsSettingsPage cbUpdaeModules ThreeState
Remove  UpdateSubmodules on pull
Associate UpdateSubmodules with MergeConflict (Pull, CherryPick, Revert, Stash and MergeBranch)