Player platform:

Windows, 64 bits continuous build.

Describe the issue in detail and how to reproduce it:

When using the command Control Variables: Item 0 is Equipped, the RPG_RT will list the number of free equipment slots in your party. Currently EasyRPG does not support that and will always answer 0.

In an example here, I only have Alex in my party, and only two of the five equipment slots are used: the game answers 3 to this command.