Per-map parallax support (#9786)

* Per-map parallax support

* Comments for future sloth

* c

* bet

* Fix exception

* VV support

* Fix parallax

* mem

* weightless sounds

* Gravity stuff

* placeholder coz im too lazy to stash don't @ me son

* decent clouds

* sky

* Fast parallax

* Imagine spelling

* Loicense

* perish

* Fix weightless status

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.IntegrationTests/Tests/Gravity/WeightlessStatusTests.cs

@@ -11,7 +11,7 @@ using Robust.Shared.Map;
 namespace Content.IntegrationTests.Tests.Gravity
 {
     [TestFixture]
-    [TestOf(typeof(WeightlessSystem))]
+    [TestOf(typeof(GravitySystem))]
     [TestOf(typeof(GravityGeneratorComponent))]
     public sealed class WeightlessStatusTests
     {
@@ -21,6 +21,9 @@ namespace Content.IntegrationTests.Tests.Gravity
   id: HumanDummy
   components:
   - type: Alerts
+  - type: Physics
+    bodyType: Dynamic
+
 - type: entity
   name: GravityGeneratorDummy
   id: GravityGeneratorDummy
@@ -38,7 +41,6 @@ namespace Content.IntegrationTests.Tests.Gravity
             await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings{NoClient = true, ExtraPrototypes = Prototypes});
             var server = pairTracker.Pair.Server;
 
-            var mapManager = server.ResolveDependency<IMapManager>();
             var entityManager = server.ResolveDependency<IEntityManager>();
             var alertsSystem = server.ResolveDependency<IEntitySystemManager>().GetEntitySystem<AlertsSystem>();