Adds a new section "Scripting" in the server UI where PowerShell modules can be defined. These can be used for defining a library of functions that can be used in any script. These modules are automatically synced to the launcher and imported upon script execution.
Created a new abstraction for migrations that have to run against the file system, so that we don't need to do the check in each migration.
Adding the default DB name to the settings so it's got a const value.
Updated the Settings migrator to check a few more places
