Remove unused CDataStream

src/streams.h

@@ -279,42 +279,6 @@ public:
     }
 };
 
-class CDataStream : public DataStream
-{
-private:
-    int nType;
-    int nVersion;
-
-public:
-    explicit CDataStream(int nTypeIn, int nVersionIn)
-        : nType{nTypeIn},
-          nVersion{nVersionIn} {}
-
-    explicit CDataStream(Span<const uint8_t> sp, int type, int version) : CDataStream{AsBytes(sp), type, version} {}
-    explicit CDataStream(Span<const value_type> sp, int nTypeIn, int nVersionIn)
-        : DataStream{sp},
-          nType{nTypeIn},
-          nVersion{nVersionIn} {}
-
-    int GetType() const          { return nType; }
-    void SetVersion(int n)       { nVersion = n; }
-    int GetVersion() const       { return nVersion; }
-
-    template <typename T>
-    CDataStream& operator<<(const T& obj)
-    {
-        ::Serialize(*this, obj);
-        return *this;
-    }
-
-    template <typename T>
-    CDataStream& operator>>(T&& obj)
-    {
-        ::Unserialize(*this, obj);
-        return *this;
-    }
-};
-
 template <typename IStream>
 class BitStreamReader
 {