Spell scrolls (#571)

* scroll spells

* refactor magic system

* Update spawners.yml

* safe use

* Update magic-spells.ftl

Content.Shared/_CP14/MagicSpellStorage/CP14SpellStorageUseDamageComponent.cs

@@ -0,0 +1,16 @@
+using Content.Shared.Damage;
+
+namespace Content.Shared._CP14.MagicSpellStorage;
+
+/// <summary>
+/// Causes damage to the Spell storage when spells from it are used
+/// </summary>
+[RegisterComponent, Access(typeof(CP14SpellStorageSystem))]
+public sealed partial class CP14SpellStorageUseDamageComponent : Component
+{
+    /// <summary>
+    /// the amount of damage this entity will take per unit manacost of the spell used
+    /// </summary>
+    [DataField(required: true)]
+    public DamageSpecifier DamagePerMana = default!;
+}