Exploded D3HeroesTool/Utils in namespaces dedicated for each kind of tool (converters, behaviors etc...)

--HG--
rename : D3HeroesTool/Utils/ComboBoxWidthFromItemBehavior.cs => D3HeroesTool/Behaviors/ComboBoxWidthFromItemBehavior.cs
rename : D3HeroesTool/Utils/EnumDisplayer.cs => D3HeroesTool/Converters/EnumDisplayer.cs
rename : D3HeroesTool/Utils/HeroPortraitSubRectConverter.cs => D3HeroesTool/Converters/HeroPortraitSubRectConverter.cs
rename : D3HeroesTool/Utils/ValidationErrorConverter.cs => D3HeroesTool/Converters/ValidationErrorConverter.cs
rename : D3HeroesTool/Utils/ComboBoxExtensionMethods.cs => D3HeroesTool/Extensions/ComboBoxExtensionMethods.cs
rename : D3HeroesTool/Utils/BattleTagValidator.cs => D3HeroesTool/Validators/BattleTagValidator.cs