UNDERMU — FPS visual timing update (includes required Settings.ini)

Upload Main.dll, Settings.ini and update.json from this folder to:
https://updates.undermuserver.com/update/

Overwrite the existing Main.dll and update.json, and add/overwrite Settings.ini.
Keep the other existing files on the host. The manifest retains their current
entries and adds both the new DLL and the FPS settings.

Settings.ini enforces:
- MaxFPS = 120
- VSync = 0
- DecoupleLogicAndRender = 1

It also distributes the current UnderMU graphics/effects defaults, so this update
intentionally replaces each player's Settings.ini. Upload it only if that is desired.

Verify after upload that update/update.json contains:
- Main.dll: 1544192 bytes, MD5 1f05f69d5e8d991d08016f461a0e3f03
- Settings.ini: 304 bytes, MD5 84b32147e9d45ed234e980514abd13ce