make fire not burn through hardsuits (#27161)

* add FireProtection system and event

* minor optimisation + make flammable use fire protection event

* add fire protection values to some things, nerf firesuit heat resistance

* bruh

* unrevert laser nerfs, make elite hardsuit fully fireproof

---------

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Shared/Atmos/GetFireProtectionEvent.cs

@@ -0,0 +1,33 @@
+using Content.Shared.Inventory;
+
+namespace Content.Shared.Atmos;
+
+/// <summary>
+/// Raised on a burning entity to check its fire protection.
+/// Damage taken is multiplied by the final amount, but not temperature.
+/// TemperatureProtection is needed for that.
+/// </summary>
+[ByRefEvent]
+public sealed class GetFireProtectionEvent : EntityEventArgs, IInventoryRelayEvent
+{
+    public SlotFlags TargetSlots { get; } = ~SlotFlags.POCKET;
+
+    /// <summary>
+    /// What to multiply the fire damage by.
+    /// If this is 0 then it's ignored
+    /// </summary>
+    public float Multiplier;
+
+    public GetFireProtectionEvent()
+    {
+        Multiplier = 1f;
+    }
+
+    /// <summary>
+    /// Reduce fire damage taken by a percentage.
+    /// </summary>
+    public void Reduce(float by)
+    {
+        Multiplier -= by;
+    }
+}