Fix presentation loading bug

src/loader.gd

@@ -153,11 +153,12 @@ Further arguments:
 				processed["presentation"] = true
 				
 				# Check if file exists
-				if !FileAccess.file_exists(arg):
+				if !FileAccess.file_exists(arg) and !DirAccess.dir_exists_absolute(arg):
 					logger.error(core.misc.stringify_variables("Unable to parse argument %arg%: Invalid file path %arg%", { "arg": arg }))
 					continue
 				
 				# Update 'args'
+				args["load_presentation"] = true
 				args["presentation_path"] = arg
 	
 	return args