Condition: count spells by spell class

[dseguin]

Summary

None

Purpose of change

Very simple and quick addition.

• Fixes Condition spell_count by school #67897

Describe the solution

Adds a u_val variable called "spell_count" that returns the number of spells that a character knows. An optional "school" parameter will make it return only the number of spells known of that school/spell class.

Describe alternatives you've considered

Testing

Quick & dirty test in-game with these EOCs (with Magiclysm)

{
  "type": "effect_on_condition",
  "id": "TEST_SPELL_COUNT_RAW",
  "recurrence": 1,
  "condition": { "compare_num": [ { "u_val": "spell_count" }, "=", { "const": 3 } ] },
  "effect": [
    {
      "u_message": "TEST: you have 3 (TOTAL) spells.",
      "type": "good"
    }
  ]
},
{
  "type": "effect_on_condition",
  "id": "TEST_SPELL_COUNT_SCHOOL",
  "recurrence": 1,
  "condition": { "compare_num": [ { "u_val": "spell_count", "school": "MAGUS" }, "=", { "const": 3 } ] },
  "effect": [
    {
      "u_message": "TEST: you have 3 (MAGUS) spells.",
      "type": "good"
    }
  ]
}

Debugging 3 non-magus spells into the player and activating both EOCs, only the first (non-school-specific) one activates. Adding another 3 magus spells (6 total) and activating both EOCs, only the second (school-specific) one activates.

Additional context