Battle formulas: action values as stat formulas, costs from stat pools, MP gauge for party members, action schema

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

locale/en.properties

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+mod_battle_formulas_name = Battle Formulas
+mod_battle_formulas_desc = Battle actions as data for every battle core: an action with “Formula=a.mag * 3 - b.mdf + rand(0, 4)” needs no code — damage or healing, a mana price (Cost=mp:5), shield piercing, a status with a chance. a.* is the one acting, b.* the target: their stats and live health, attack, defence and points. The same skill works in the FF-style battle and in the card battle. Enemies with stats take their battle numbers from their sheets.
+battle_formulas/schema/field/values = Values
+battle_formulas/schema/field/values_desc = The action's parameters; keys the schema does not know are kept as they are
+battle_formulas/schema/field/required_point = Action points
+battle_formulas/schema/field/formula = Formula
+battle_formulas/schema/battle/formula_desc = a.* is the one acting, b.* the target: a.atk * 2 - b.def + rand(0, 3)
+battle_formulas/schema/field/effect = Effect
+battle_formulas/schema/field/cost = Cost
+battle_formulas/schema/battle/cost_desc = A pool cost, e.g. mp:4
+battle_formulas/schema/field/pierce = Pierce
+battle_formulas/schema/battle/pierce_desc = Damage goes past the shield
+battle_formulas/schema/field/state = Status
+battle_formulas/schema/field/state_turns = Status turns
+battle_formulas/schema/field/state_chance = Status chance, %
+battle_formulas/schema/field/attack_factor = Attack factor
+battle_formulas/schema/battle/attack_desc = For the cores' plain attacks: the attack factor
+battle_formulas/schema/field/attack_type = Attack type
+battle_formulas/schema/field/turn = Turns