Allow to fetch json configuration from custom path

[helios-ag]

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• I have checked that the bug I am reporting can be replicated, or that the feature I am suggesting isn't already present.
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Hi!
I want to implement dynamically changeable behavior for client side configuration, (i.e. dynamically build filemanager.config.json). This will for example provide custom UI based on user role.
As far as i can see, paths for configuration files are hardcoded. I propose to add something like configUrl to available options,

var defaults = {
    baseUrl: '.',	// relative path to the FM plugin folder
    configUrl: null, // Config url

and extend loadConfigFile with something like this

var loadConfigFile = function (type) {
	var url = null;
	type = (typeof type === 'undefined') ? 'user' : type;

	if(type === 'user') {
		if(_url_.param('config')) {
			url = fm.settings.baseUrl + '/config/' + _url_.param('config');
		} else {
			url =  fm.settings.configUrl ?  fm.settings.configUrl : fm.settings.baseUrl + '/config/filemanager.config.json'; // if configUrl is defined
		}
	} else {
		url = fm.settings.baseUrl + '/config/filemanager.config.default.json';
	}

	return $.ajax({
		type: 'GET',
		url: url,
		dataType: 'json',
		cache: false,
		error: function(response) {
			fm.error('Given config file (' + url + ') does not exist!');
		}
	});
};

[submediax]

Al Ganiev hello,
Please consider implementation of this issue as well.
Thanks

[psolom]

Your PR have been merged.