Add load_any_supported for arbitrary file extensions

vfs.gd

@@ -101,6 +101,24 @@ func load_supported(path:String, ext_override:String = "")->Variant:
 	return result
 
 
+## Like load_supported, but expects [param path] to not have an extension.
+## Instead, [param extensions] can contain multiple extensions, which will be
+## appended and checked to exist. This allows for prioritizing one format
+## over another or loosely defining a file id and allowing the engine to
+## find a first match.
+func load_any_supported(base_path:String, extensions:Array[String] = [])->Variant:
+	var _append_ext := func _append_ext(ext:String)->String:
+			return (base_path + ext) \
+				if ext.begins_with(".") \
+				else (base_path + "." + ext)
+	var try_paths:Array = extensions.map(_append_ext)
+	for path:String in try_paths:
+		if not file_exists(path):	continue
+		return load_supported(path)
+	push_error("Could not find any file for '%s'.%s!" % [base_path, extensions])
+	return null
+
+
 ## [param parse] Callable(buffer:PackedByteArray)->Variant
 func load_and_parse(path:String, parse:Callable)->Variant:
 	var abs_path:String = get_absolute_path(path)