Procgen biomes (#13487)

* Planetmap tiles

Biomes etc etc

* a

* oop

* Chunk-based rendering

* funny

* Less allocations

* Fix overdraw

* Content tile edge support

Also updated grass to use it as a POC.

* Kindly revert

* Update for variant edges

* fixes

* Use fastnoise

* Remove redundant group

* a

* refactor a fair bit

* Prototype data instead

* tweaks

* a

* fix maths

* working

* a

* Slightly better empty support

* a

* flowers

* sounds

* lewd

* Networking

* more fixes

* better

* colours

* Some chunk loading

* Proper loading and unloading

* Better loading

* Fix parallax and movement sounds

* Anchoring support + decal setup

* Most of the way to load and unload

* Decal loading kinda werkin

* large trees

* started diffing

* a

* Variant support and deserts

* a

* snow

* agony, even

* working again

* todo

* a

* laba tiles

* aeiou

* a

# Conflicts:
#	Resources/Prototypes/Entities/Tiles/planet.yml
#	Resources/Prototypes/Tiles/planet.yml
#	Resources/Textures/Tiles/Planet/Lava/lava.rsi/meta.json

* laba

* Add lava

* Initial ignition

* triggers

* a

* a

* y

* Add basalt tiles

Did some unconventional things for the animation + rocks.

* fixies

* mergies

* promotion

* lava biome

* Lava planet start

* cleanup and more lava

* laba

* maccas

* biome stuf

* weh

* bongflicts

* aeaeae

* More fixes

* a

* these too

Content.Shared/Parallax/Biomes/BiomeComponent.cs

@@ -0,0 +1,39 @@
+using Robust.Shared.GameStates;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Shared.Parallax.Biomes;
+
+[RegisterComponent, NetworkedComponent]
+public sealed class BiomeComponent : Component
+{
+    [ViewVariables(VVAccess.ReadWrite), DataField("seed")]
+    public int Seed;
+
+    [ViewVariables(VVAccess.ReadWrite),
+     DataField("prototype", customTypeSerializer: typeof(PrototypeIdSerializer<BiomePrototype>))]
+    public string BiomePrototype = "Grasslands";
+
+    // TODO: Need to flag tiles as not requiring custom data anymore, e.g. if we spawn an ent and don't unspawn it.
+
+    /// <summary>
+    /// If we've already generated a tile and couldn't deload it then we won't ever reload it in future.
+    /// Stored by [Chunkorigin, Tiles]
+    /// </summary>
+    [DataField("modifiedTiles")]
+    public Dictionary<Vector2i, HashSet<Vector2i>> ModifiedTiles = new();
+
+    /// <summary>
+    /// Decals that have been loaded as a part of this biome.
+    /// </summary>
+    [DataField("decals")]
+    public Dictionary<Vector2i, Dictionary<uint, Vector2i>> LoadedDecals = new();
+
+    [DataField("entities")]
+    public Dictionary<Vector2i, List<EntityUid>> LoadedEntities = new();
+
+    /// <summary>
+    /// Currently active chunks
+    /// </summary>
+    [ViewVariables]
+    public readonly HashSet<Vector2i> LoadedChunks = new();
+}