Advanced Filters - Arena sets filter

This is a plugin for the "Advanced Filters - Updated" addon.

Dependencies:
Advanced Filters - Updated and LibSets

Features:

• Show only items that belong to a particular arena set
• Show only items that belong to any arena set

Use command "/af_arenaset" to toggle between showing only "All arena sets" entry or one for each set.

Base code was taken 100% from Baertram's Monster sets filter plugin and I changed the names to "Arena" + made it read the arena sets instead!