Holy crap auth works (#2099)

* Holy crap auth works

* Fix some usages of UserID instead of UserName

* Refactor preferences.

They be non-async now. Also faster.

* Rename DbContext.

* Guest username assignment.

* Fix saving of profiles.

* Don't store data for guests.

* Fix generating invalid random colors.

* Don't allow dumb garbage for char preferences.

* Bans.

* Lol forgot to fill out the command description.

* Connection log.

* Rename all the tables and columns to be snake_case.

* Re-do migrations.

* Fixing tests and warnings.

* Update submodule

Content.Server.Database/Content.Server.Database.csproj

@@ -21,4 +21,9 @@
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="3.1.4" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Folder Include="Migrations\Postgres" />
+    <Folder Include="Migrations\Sqlite" />
+  </ItemGroup>
+
 </Project>