* Script updates:
- Updated Nameless Island quests and added questlog support in quests_nameless and quests_prontera. (fixes bugreport:7992)
- Updated "God Item Creation" scripts to their latest versions: seals roll at 25/50 instead of 50/100 in Renewal.
- Updated Soul Linker job quest with new checks.
- Fixed an untranslated Manuk NPC.
- Some follow-ups to previous commits.

* GM Management System:
- Enabled all official GM Management NPCs and wrote a function to control their usage.
- Implemented some missing GM Management NPCs (still incomplete).

Signed-off-by: Euphy <euphy@rathena.org>