Upstream species (#6066)

* Step 1 of porting; grabbed most of the files via patches.

* Add species field to the DB

* Appearance patches for slimes.

* Fix the db test.

* Add slime's biocompat.

* slimby

* Fixes, allow specifying if a species is playable or not.

* Update Content.Client/Preferences/UI/HumanoidProfileEditor.xaml.cs

Co-authored-by: Javier Guardia Fernández <DrSmugleaf@users.noreply.github.com>

* Update Content.Client/Preferences/UI/HumanoidProfileEditor.xaml.cs

Co-authored-by: Javier Guardia Fernández <DrSmugleaf@users.noreply.github.com>

* Update Content.Client/Preferences/UI/HumanoidProfileEditor.xaml.cs

Co-authored-by: Javier Guardia Fernández <DrSmugleaf@users.noreply.github.com>

* Address reviews.

* Address reviews.

* make an if-case.

* Fix a goof where species wouldn't get shown in the editor correctly (it'd always default to human)

Co-authored-by: Javier Guardia Fernández <DrSmugleaf@users.noreply.github.com>

Content.Server.Database/Migrations/Postgres/20220108185749_add-species.cs

@@ -0,0 +1,26 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Content.Server.Database.Migrations.Postgres
+{
+    public partial class addspecies : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "species",
+                table: "profile",
+                type: "text",
+                nullable: false,
+                defaultValue: "");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "species",
+                table: "profile");
+        }
+    }
+}