FRED has an autosave feature but it wasn't invoked in too many places. This adds autosaving whenever a major dialog is closed, unless it was closed by hitting Cancel. NB: Autosave is not yet implemented in qtFRED.
Also, `addvariabledlg` incorrectly referred to `OnOk` instead of `OnOK` and `CMessageEditorDlg` incorrectly referred to `OnOK` instead of `OnOk`, so this fixes those and distinguishes `OnOk` by renaming it `OnButtonOk` to be consistent with the event editor and other dialogs.
* Add "no-first-wave-message" wing flag
For when you want custom dialogue for the first wave, and automatic announcements for the rest.
* Fix FRED macro name
Same arrival warp when docked, same departure warp when docked, and associated changes to FRED, set-arrival-info, and set-departure-info.
Also fixes the nav-carry flag to properly save when a mission is saved. Previously that flag would always be cleared.
Implements feature from #4095.
1) Fixes the ship and wing dialog resizing for both sexp help and arrival/departure cues
2) Restores the sexp help in the Mission Goals dialog, which had been broken since the mini-help-box was added
Partial revert of Mantis #2053:
http://scp.indiegames.us/mantis/view.php?id=2053
The patch was speculative and there was never a confirmed bug. By contrast, there are plenty of existing missions that use Unknown as a ship, wing, or jump node name and work just fine.
This introduces a new mechanism for handling bit flags. Instead of using an int (or two, or three) to write bits into, this uses the std::bitset in a wrapper class that accepts an enum class as input. This means that certain classes of errors we've had a few of in the engine, where a coder used the wrong set of flags or checked them against the wrong variable (SF_STEALTH vs SIF_STEALTH, for example) can now be detected at a compiler level rather than not at all.
Goober5000