Another Quarantine Zone Update (Read description)

- Added Captain Piett conversation script starter.
- Added conversation script for Quarantine Stormtrooper leader.
- Added Quarantine Stormtrooper leader mobile.
- Added correct stormtrooper guards.
- Added hx-138 stormtrooper mobile.
- Fixed Captain Piett's stf name.
- Fixed spawn areas for multiple NPCs in Quarantine zone.
- Changed Quarantine Stormtrooper leader to correct name.
- Worked more on the Imperial Gate guard conversation script.