Fix reload XML files from lua

[ramon-bernardo]

Pull Request Prelude

• I have followed proper The Forgotten Server code styling.
• I have read and understood the contribution guidelines before making this PR.
• I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Fix the problem with XML reloading via Lua; when a reload occurred, the Lua state was reset, but the XML file data was not reloaded correctly.

Changes Proposed

• It no longer loads during the start event but instead when the Lua files are loaded
• Move it to a separate folder in data/scripts/xml.

On reload

[ramon-bernardo]

The other alternative would be to create a new global event for handling server reloads. However, some points to consider are when to trigger it: only when reloading scripts? actions? ...