Botany composting & shovel/spade (or, make botany sustainable) (#3064)

* Botany: Introduce shovel and spade into hydro\_tools

* Botany: Add shovel/spade (just removes plants)

* Botany: Add shovel/spade lathe recipes and make all botany lathe recipes accessible

* Botany: Add spade into Saltern

* Botany: Give Saltern a bucket for the botanist

* Botany: Plant produce can be composted for nutriment/etc.

* Botany: Bye-bye duplicated force update code, hello ForceUpdateByExternalCause

* Botany: Shovel identity crisis resolved (thanks Paul)

Content.Server/GameObjects/Components/Botany/ShovelComponent.cs

@@ -0,0 +1,11 @@
+#nullable enable
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.GameObjects.Components.Botany
+{
+    [RegisterComponent]
+    public class ShovelComponent : Component
+    {
+        public override string Name => "Shovel";
+    }
+}