Add Blueprint Restriction Validator

[KaosSpectrum]

This validator can be used to restrict functions/event overrides and implementation in blueprint classes.

Usage

1. Create a validator by deriving from UEditorValidator_BlueprintRestriction.

2. Override AppliesTo() to restrict which assets the validator should scan.

3. Override BuildNodeRules() to block Blueprint events, overrides, or custom node patterns.

4. Override BuildCallRules() to block calls to specific functions.

Example:

virtual void BuildNodeRules(TArray<FEditorValidatorBlueprintNodeRule>& OutRules) const override
{
	OutRules.Add(
		FORBID_OVERRIDE(TEXT("ReceiveTick"))
			.Message(TEXT("Blueprint Tick is not allowed."))
			.Suggest(TEXT("Use a timer or native C++ update path instead."))
			.Warning()
	);
	
	OutRules.Add(
		FORBID_OVERRIDE(TEXT("K2_ActivateAbility"))
			.When([](const UBlueprint* Blueprint)
			{
				return Blueprint
					&& Blueprint->GeneratedClass
					&& Blueprint->GeneratedClass->IsChildOf(
						UMyActionGameplayAbility::StaticClass());
			})
			.Message(TEXT("Do not override ActivateAbility directly in UMyActionGameplayAbility."))
			.Suggest(TEXT("Move gameplay logic into OnActionStarted instead."))
			.Error()
	);
}

virtual void BuildCallRules(TArray<FEditorValidatorBlueprintCallRule>& OutRules) const override
{
	OutRules.Add(
		FORBID_CALL(UGameplayStatics::StaticClass(), TEXT("GetAllActorsOfClass"))
			.Message(TEXT("GetAllActorsOfClass is not allowed in this Blueprint."))
			.Suggest(TEXT("Use a cached registry or subsystem lookup instead."))
			.PerformanceWarning()
	);
	
		OutRules.Add(
			FORBID_CALL(UGameplayStatics::StaticClass(), TEXT("PlaySound2D"))
				.When([](const UBlueprint* Blueprint)
				{
					return Blueprint
						&& Blueprint->GeneratedClass
						&& !Blueprint->GeneratedClass->IsChildOf(UUserWidget::StaticClass());
				})
				.Message(TEXT("PlaySound2D is only allowed from UI widgets. Gameplay Blueprints must route audio through the project audio subsystem."))
				.Suggest(TEXT("Use UGameAudioSubsystem::PlaySfx or an approved audio event wrapper instead."))
				.Error()
);
}

Also there is a limited BP version using developer settings for node override/implementation restrictions.