Convert the allowed-ships and allowed-weapons lists to sets, rather than naive vectors that stored a true/false for every class. Since these are ordered sets, iteration occurs in the same sequence as iteration of `Ship_info` or `Weapon_info`. Associated data structures such as `Granted_ships` and `Granted_weapons` are converted as well.
Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>
1. Properly initialize campaign links and elements so that stale values don't stick around from previously loaded campaigns.
2. Clear internal flag bits from campaign missions to prevent invalid state from being loaded from a campaign file.
3. Properly check the main hall when saving flags in retail format.
4. Clean up parsing and saving of mission loop data, which had been broken ever since retail. Add compatibility checks for the old format.
Not using the return value from `optional_string_fred` triggers Coverity warnings, but it turns out those "consume token" blocks aren't actually needed.
While we're at it, make the token parsing a little more robust in campaignsave.cpp and clean up the newline behavior.
* Generalize mission save from original FRED
* make qtfred use the new generalized missionsave
* split campaign save into a sister class
* allow unlimited campaign description length to be saved
* have the campaign editor pass the links to save properly
* cleanup
* future todo
* fixes
* more fixes
* cleanup vars
* clang
* add missing guardian threshold and fix var name
* more clang
* conflict resolution error
* update qtfred to use the new campaign save
