Base: fix warnings reported by code analysers

* disable copy-constructor and assignment operator for Stream classes
* remove destructor of sub-classes of SequencerBase
* fix some old C-style cast warnings

src/Base/Stream.h

@@ -52,6 +52,8 @@ public:
 
 protected:
     Stream();
+    Stream(const Stream&) = default;
+    Stream& operator=(const Stream&) = default;
     virtual ~Stream();
 
     bool _swap;
@@ -147,6 +149,10 @@ protected:
         std::ios_base::openmode which =
             std::ios::in | std::ios::out);
 
+private:
+    ByteArrayOStreambuf(const ByteArrayOStreambuf&);
+    ByteArrayOStreambuf& operator=(const ByteArrayOStreambuf&);
+
 private:
     QBuffer* _buffer;
 };
@@ -174,6 +180,9 @@ protected:
     virtual pos_type seekpos(std::streambuf::pos_type pos,
         std::ios_base::openmode which =
             std::ios::in | std::ios::out);
+private:
+    ByteArrayIStreambuf(const ByteArrayIStreambuf&);
+    ByteArrayIStreambuf& operator=(const ByteArrayIStreambuf&);
 
 private:
     const QByteArray& _buffer;
@@ -201,6 +210,10 @@ protected:
     virtual pos_type seekpos(std::streambuf::pos_type sp,
         std::ios_base::openmode which =
             std::ios::in | std::ios::out);
+private:
+    IODeviceOStreambuf(const IODeviceOStreambuf&);
+    IODeviceOStreambuf& operator=(const IODeviceOStreambuf&);
+
 protected:
     QIODevice* device;
 };
@@ -225,6 +238,9 @@ protected:
     virtual pos_type seekpos(std::streambuf::pos_type sp,
         std::ios_base::openmode which =
             std::ios::in | std::ios::out);
+private:
+    IODeviceIStreambuf(const IODeviceIStreambuf&);
+    IODeviceIStreambuf& operator=(const IODeviceIStreambuf&);
 
 protected:
     QIODevice* device;
@@ -270,6 +286,10 @@ private:
     bool flushBuffer();
     bool writeStr(const char* s, std::streamsize num);
 
+private:
+    PyStreambuf(const PyStreambuf&);
+    PyStreambuf& operator=(const PyStreambuf&);
+
 private:
     PyObject* inp;
     Type type;
@@ -296,6 +316,10 @@ protected:
         std::ios_base::openmode which =
             std::ios::in | std::ios::out);
 
+private:
+    Streambuf(const Streambuf&);
+    Streambuf& operator=(const Streambuf&);
+
 private:
     std::string::const_iterator _beg;
     std::string::const_iterator _end;