Salvage magnet revamp (#23119)

* Generic offering window

* More work

* weh

* Parity

* Progression meter

* magnet

* rona

* PG asteroid work

* code red

* Asteroid spawnings

* clams

* a

* Marker fixes

* More fixes

* Workings of biome asteroids

* A

* Fix this loading code

* a

* Fix masking

* weh

* Fixes

* Magnet claiming

* toe

* petogue

* magnet

* Bunch of fixes

* Fix default

* Fixes

* asteroids

* Fix offerings

* Localisation and a bunch of fixes

* a

* Fixes

* Preliminary draft

* Announcement fixes

* Fixes and bump spawn rate

* Fix asteroid spawns and UI

* More fixes

* Expeditions fix

* fix

* Gravity

* Fix announcement rounding

* a

* Offset tweak

* sus

* jankass

* Fix merge

Content.Shared/Salvage/SalvageMapPrototype.cs

@@ -0,0 +1,15 @@
+using Robust.Shared.Prototypes;
+using Robust.Shared.Utility;
+
+namespace Content.Shared.Salvage;
+
+[Prototype]
+public sealed class SalvageMapPrototype : IPrototype
+{
+    [ViewVariables] [IdDataField] public string ID { get; } = default!;
+
+    /// <summary>
+    /// Relative directory path to the given map, i.e. `Maps/Salvage/template.yml`
+    /// </summary>
+    [DataField(required: true)] public ResPath MapPath;
+}