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Goober5000
704bf95a75
Per #4294, this adds two new flag that, together, are equivalent to the legacy "immobile" flag but individually provide more fine-grained control. Since the physics for position and orientation have a bit of overlap, the new flag functionality simply reverts whatever position or orientation changes were done by the physics sim. In the FRED and qtFRED ship flags dialogs, the "immobile" flag (aka "Does Not Move") is replaced by the two new flags, but in FSO the situation is more complicated. The old and new flags coexist and have overlapping functionality, so the mission designer must be careful to set and unset the appropriate flag (that is, it is possible for both "immobile" and "don't-change-position" to be set at the same time, in which case the ship cannot change position without both flags being unset). The `set-immobile` and `set-mobile` legacy SEXPs ensure that the new flags are removed so as not to conflict with the legacy flag, but the `alter-ship-flag` and `are-ship-flags-set` SEXPs and the `getFlag` and `setFlag` script functions use exactly what the FREDder/scripter specifies and nothing else. (I attempted to completely replace "immobile" with the two newer flags, but it proved intractable to do this while maintaining reverse compatibility: retrofitting single-flag functions to apply dual flags for one particular situation made the functions harder to understand as well as introducing many edge cases and opportunities for bugs or "gotchas".) Implements #4294.