FScriptableToolsEditorModeStyle::TryRegisterCustomIcon

Try to find a png or svg icon at FileNameWithPath and register it in the style set with the given StyleIconIdentifier, ie so that later it can be found [FSlateIcon](API\Runtime\SlateCore\Textures\FSlateIcon)([FScriptableToolsEditorModeStyle::Get()](API\Plugins\ScriptableToolsEditorMode\FScriptableToolsEditorModeStyle\Get)->[GetStyleSetName()](API\Plugins\ScriptableToolsEditorMode\FScriptableToolsEditorModeStyle\GetStyleSetName), StyleIconIdentifier).