-Added %servervariables_list_values_% PlaceholderAPI variable to show all the set values from a player list.

-Added %servervariables_list_globalvalues_% PlaceholderAPI variable to show all the set values from a global list.

-Added variables.list_values_separator configuration to modify the separator used in the previous variables.

-Modified: Small improvement when loading player data before joining the server.