Avoid using ESM4::Cell with uninitialized fields

apps/openmw/mwworld/worldmodel.cpp

@@ -129,7 +129,7 @@ MWWorld::CellStore& MWWorld::WorldModel::getExterior(ESM::ExteriorCellLocation c
                 record.mParent = cellIndex.mWorldspace;
                 record.mX = cellIndex.mX;
                 record.mY = cellIndex.mY;
-                record.mCellFlags = 0;
+                // Other ESM4::Cell members use default values from class definition.
                 cell = mStore.insert(record);
             }
             CellStore* cellStore

components/esm4/lighting.hpp

@@ -35,16 +35,16 @@ namespace ESM4
 
     // FO3/FNV version of the struct
     struct Lighting
-    { //               | Aichan Prison values
-        std::uint32_t ambient; //               | 16 17 19 00 (RGBA)
-        std::uint32_t directional; //               | 00 00 00 00 (RGBA)
-        std::uint32_t fogColor; //               | 1D 1B 16 00 (RGBA)
-        float fogNear; // Fog Near      | 00 00 00 00 = 0.f
-        float fogFar; // Fog Far       | 00 80 3B 45 = 3000.f
-        std::int32_t rotationXY; // rotation xy   | 00 00 00 00 = 0
-        std::int32_t rotationZ; // rotation z    | 00 00 00 00 = 0
-        float fogDirFade; // Fog dir fade  | 00 00 80 3F = 1.f
-        float fogClipDist; // Fog clip dist | 00 80 3B 45 = 3000.f
+    { //                                  | Aichan Prison values
+        std::uint32_t ambient = 0; //     | 16 17 19 00 (RGBA)
+        std::uint32_t directional = 0; // | 00 00 00 00 (RGBA)
+        std::uint32_t fogColor = 0; //    | 1D 1B 16 00 (RGBA)
+        float fogNear = 0; // Fog Near    | 00 00 00 00 = 0.f
+        float fogFar = 0; // Fog Far      | 00 80 3B 45 = 3000.f
+        std::int32_t rotationXY = 0; //   | 00 00 00 00 = 0
+        std::int32_t rotationZ = 0; //    | 00 00 00 00 = 0
+        float fogDirFade = 0; //          | 00 00 80 3F = 1.f
+        float fogClipDist = 0; //         | 00 80 3B 45 = 3000.f
         float fogPower = 1.f; // TES4 doesn't have this
     };
 

components/esm4/loadcell.hpp

@@ -80,13 +80,13 @@ namespace ESM4
         FormId mGlobal;
         FormId mClimate;
         FormId mWater;
-        float mWaterHeight = 0;
+        float mWaterHeight = sInvalidWaterLevel;
 
         std::vector<FormId> mRegions;
         Lighting mLighting;
 
         FormId mLightingTemplate; // FO3/FONV
-        std::uint32_t mLightingTemplateFlags; // FO3/FONV
+        std::uint32_t mLightingTemplateFlags = 0; // FO3/FONV
 
         FormId mMusic; // FO3/FONV
         FormId mAcousticSpace; // FO3/FONV