Explicitly delete copy c-tor + copy operator to for Visual Studio.

VS requires to have copy operations disabled on classes which hold vectors of unique pointers (clang is a bit more relaxed about this).

runtime/Cpp/runtime/src/BufferedTokenStream.h

@@ -50,6 +50,9 @@ namespace antlr4 {
   class ANTLR4CPP_PUBLIC BufferedTokenStream : public TokenStream {
   public:
     BufferedTokenStream(TokenSource *tokenSource);
+    BufferedTokenStream(const BufferedTokenStream& other) = delete;
+
+    BufferedTokenStream& operator = (const BufferedTokenStream& other) = delete;
 
     virtual TokenSource* getTokenSource() const override;
     virtual size_t index() override;

runtime/Cpp/runtime/src/ListTokenSource.h

@@ -76,6 +76,9 @@ namespace antlr4 {
     /// <seealso cref="TokenSource"/>. </param>
     /// <exception cref="NullPointerException"> if {@code tokens} is {@code null} </exception>
     ListTokenSource(std::vector<std::unique_ptr<Token>> tokens);
+    ListTokenSource(const ListTokenSource& other) = delete;
+
+    ListTokenSource& operator = (const ListTokenSource& other) = delete;
 
     /// <summary>
     /// Constructs a new <seealso cref="ListTokenSource"/> instance from the specified

runtime/Cpp/runtime/src/UnbufferedTokenStream.h

@@ -39,8 +39,11 @@ namespace antlr4 {
   public:
     UnbufferedTokenStream(TokenSource *tokenSource);
     UnbufferedTokenStream(TokenSource *tokenSource, int bufferSize);
+    UnbufferedTokenStream(const UnbufferedTokenStream& other) = delete;
     virtual ~UnbufferedTokenStream();
 
+    UnbufferedTokenStream& operator = (const UnbufferedTokenStream& other) = delete;
+
     virtual Token* get(size_t i) const override;
     virtual Token* LT(ssize_t i) override;
     virtual ssize_t LA(ssize_t i) override;