Add symbol table search scaffolding and ELF32 implementation

Il2CppInspector/FileFormatReader.cs

@@ -20,6 +20,7 @@ namespace Il2CppInspector
         long Position { get; set; }
         string Arch { get; }
         uint GlobalOffset { get; }
+        Dictionary<string, uint> GetSymbolTable();
         uint[] GetFunctionTable();
         U ReadMappedObject<U>(uint uiAddr) where U : new();
         U[] ReadMappedArray<U>(uint uiAddr, int count) where U : new();
@@ -76,6 +77,9 @@ namespace Il2CppInspector
             }
         }
 
+        // Find search locations in the symbol table for Il2Cpp data
+        public virtual Dictionary<string, uint> GetSymbolTable() => null;
+
         // Find search locations in the machine code for Il2Cpp data
         public virtual uint[] GetFunctionTable() => throw new NotImplementedException();