Condition spell_count by school

[Maleclypse]

Is your feature request related to a problem? Please describe.

I'd like to be able to set conditions in dialogue and eoc's that counts the number of spells the PC/NPC has in a given school of spells. And then compare against that for things to happen. Such as a trait that appears once you've learned five different spells of a specific school.

Solution you would like.

I think it would be something entered in conditions.cpp similar to

} else if( jo.has_member( "spell" ) ) {
                const std::string spell_name = jo.get_string( "spell" );
                const spell_id this_spell_id( spell_name );
                return [is_npc, this_spell_id]( dialogue & d ) {
                    return d.actor( is_npc )->get_spell_level( this_spell_id );
                };
            } else {
                return [is_npc]( dialogue & d ) {
                    return d.actor( is_npc )->get_highest_spell_level();
                };
            }

but it's currently beyond me.

Describe alternatives you have considered.

No response

Additional context

No response