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.Tests/ContentUnitTest.cs

@@ -2,6 +2,7 @@ using System.Collections.Generic;
 using System.Reflection;
 using Content.Client;
 using Content.Server;
+using Content.Shared;
 using Robust.UnitTesting;
 
 namespace Content.Tests
@@ -12,6 +13,8 @@ namespace Content.Tests
         {
             base.OverrideIoC();
 
+            SharedContentIoC.Register();
+
             if (Project == UnitTestProject.Server)
             {
                 ServerContentIoC.Register();