Loader not detected when loading scene from data

[Numa]

Hi there, 

If you try to use one of the loaders (for .obj files for instance) and you are loading your scene from a data string, not a file, babylon will use the default load function and fail.

SceneLoader._getPluginForFilename = function (sceneFilename) {
            var dotPosition = sceneFilename.lastIndexOf(".");
            var queryStringPosition = sceneFilename.indexOf("?");
            if (queryStringPosition === -1) {
                queryStringPosition = sceneFilename.length;
            }
            var extension = sceneFilename.substring(dotPosition, queryStringPosition).toLowerCase();
            for (var index = 0; index < this._registeredPlugins.length; index++) {
                var plugin = this._registeredPlugins[index];
                if (plugin.extensions.indexOf(extension) !== -1) {
                    return plugin;
                }
            }
            return this._registeredPlugins[0];
        };

It can't find the extension of course, as the fileName variable contains the scene data.

In 2.3 this use to work accidentally because the function would return _registeredPlugins[this._registeredPlugins.length - 1], which if you had an extra loader registered wold return it.

How do you guys want to go about fixing that one? optional Extension parameter? LoadFromData overload?

Thanks

[GameMonetize]

Like the idea of optional extension parameter