Fix a lot of the analyzer warnings too

MareSynchronos/Interop/GameModel/MdlFile.cs

@@ -1,5 +1,6 @@
 using Lumina.Data;
 using Lumina.Extensions;
+using System.Runtime.InteropServices;
 using System.Text;
 using static Lumina.Data.Parsing.MdlStructs;
 
@@ -92,7 +93,7 @@ public class MdlFile
             Lods[i] = lod;
         }
 
-        ExtraLods = (modelHeader.Flags2 & ModelFlags2.ExtraLodEnabled) != 0
+        ExtraLods = modelHeader.Flags2.HasFlag(ModelFlags2.ExtraLodEnabled)
             ? r.ReadStructuresAsArray<ExtraLodStruct>(3)
             : [];
 
@@ -150,6 +151,7 @@ public class MdlFile
         return (offsets, strings);
     }
 
+    [StructLayout(LayoutKind.Sequential)]
     public unsafe struct ModelHeader
     {
         // MeshHeader