[WIP] Check for level sync before allowing BCNM entry

[zach2good]

TODO:

• [x] BCNM Trade
• [x] BCNM Trigger
• [x] Set Sync inside BCNM
• [ ] Instance Trade (does this exist?)
• [ ] Instance Trigger
• [ ] Set Sync inside Instance (can we do this inside the status effect?)
• [ ] Other level sync things not covered by BCNM/Instance: Confrontation, Dynamis(?), Unity, ZNM pops (?)
• [ ] Add texts to all zones and make UpdateExtractor not freak out about it
• [ ] Add system warnings where needed
• [ ] Add more documentation to packet_system so it's more obvious where level sync happens (and how it digs down into CParty etc.)

From Caps: Attempting to enter a BCNM area with a level restriction of any king (level/master sync) "Your party is unable to participate because certain members' levels are restricted" - Message Special + TextID

Attempting to level sync in a BCNM: Level Sync could not be Activated One or more party members are currently under the effect of a status which prevents synchronization - System message?

Trying to spawn Dunes Unity NM while level synched Unable to commence Wanted battle - System message?

Trying to level sync once the Unity NM is popped: Level Sync could not be Activated One or more party members are currently under the effect of a status which prevents synchronization - System message?

TextIDs for every zone (from UpdateExtractor) text_ids_level_sync.txt

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