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/add-migration.ps1

@@ -0,0 +1,12 @@
+#!/usr/bin/env pwsh
+
+param([String]$name)
+
+if ($name -eq "")
+{
+    Write-Error "must specify migration name"
+    exit
+}
+
+dotnet ef migrations add --context SqliteServerDbContext -o Migrations/Sqlite $name
+dotnet ef migrations add --context PostgresServerDbContext -o Migrations/Postgres $name