mob dead state tweaks (#162)

~~well, it SHOULD make mob rotate on death, but it doesn't, i have no idea why~~

- Blocks character movement in crit/death
- rotates character ~~360noscope~~ 90 degrees to convince you it's lying down when dead

resolves #145
resolves #158
related to #115

Content.Client/Content.Client.csproj

@@ -111,6 +111,7 @@
     <Compile Include="UserInterface\LobbyGui.cs" />
     <Compile Include="UserInterface\NanoStyle.cs" />
     <Compile Include="Utility\ResourceCacheExtensions.cs" />
+    <Compile Include="GameObjects\Components\Mobs\SpeciesVisualizer2D.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Content.Shared\Content.Shared.csproj">