Fix ressources relative path and supress warning with remote assets with nme/openfl

[yanhick]

For all URL related functionnalities, use this class instead if possible : https://github.com/silexlabs/Cocktail/blob/master/cocktail/core/url/URL.hx

[yanhick]

For schemes (http, https), you can use the constants here : https://github.com/silexlabs/Cocktail/blob/master/cocktail/core/http/HTTPConstants.hx

[zabojad]

Waouw, that is a url handler, indeed !

OK, let me some time and I'm gonna fix it !

[yanhick]

Thanks !