SKREEEEEE (#3706)

* Import bird sprites and define basic mob.

* SKREEEEEEEEE

* Move hair styles to new sprite accessory prototypes.

Basic stuff, no multi-species stuff yet.

* Vox hair styles and clothes

* Make HumanoidCharacterProfile.Default() a static default to fix tests.

Usages that wanted the previous random behavior now call Random().

* Remove names from hair style prototypes.

(They're in localization files)

* Update Content.Shared/Actions/ActionType.cs

(sk)reeee github

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Shared/Preferences/Appearance/SpriteAccessoryCategories.cs

@@ -0,0 +1,16 @@
+using System;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Preferences.Appearance
+{
+    [Flags]
+    [Serializable, NetSerializable]
+    public enum SpriteAccessoryCategories
+    {
+        None = 0,
+        HumanHair = 1 << 0,
+        HumanFacialHair = 1 << 1,
+        VoxHair = 1 << 2,
+        VoxFacialHair = 1 << 3
+    }
+}