Bulk unload and placeholder

[chelminski]

Hi ;)
Please add a feature to bulk unload all worlds.

A placeholder that would show whether a given world is loaded or not would also be very helpful. Thanks to this, you can create many logical dependencies.

Example:
%myworlds_world_load[world_name]% (value yes/no)
%myworlds_world_load{pleceholder_world_name}% (value yes/no)