Explicitly intialize the fields in `ESM4::Cell` that don't have default constructors.

components/esm4/loadcell.hpp

@@ -64,22 +64,22 @@ namespace ESM4
     {
         FormId mFormId; // from the header
         ESM::RefId mId;
-        std::uint32_t mFlags; // from the header, see enum type RecordFlag for details
+        std::uint32_t mFlags = 0; // from the header, see enum type RecordFlag for details
 
         ESM::RefId mParent; // world formId (for grouping cells), from the loading sequence
 
         std::string mEditorId;
         std::string mFullName;
-        std::uint16_t mCellFlags; // TES5 can also be 8 bits
+        std::uint16_t mCellFlags = 0; // TES5 can also be 8 bits
 
-        std::int32_t mX;
-        std::int32_t mY;
+        std::int32_t mX = 0;
+        std::int32_t mY = 0;
 
         FormId mOwner;
         FormId mGlobal;
         FormId mClimate;
         FormId mWater;
-        float mWaterHeight;
+        float mWaterHeight = 0;
 
         std::vector<FormId> mRegions;
         Lighting mLighting;
@@ -91,9 +91,9 @@ namespace ESM4
         FormId mAcousticSpace; // FO3/FONV
         // TES4: 0 = default, 1 = public, 2 = dungeon
         // FO3/FONV have more types (not sure how they are used, however)
-        std::uint8_t mMusicType;
+        std::uint8_t mMusicType = 0;
 
-        CellGroup* mCellGroup;
+        CellGroup* mCellGroup = nullptr;
 
         ESM4::ReaderContext mReaderContext;