Limited clipboard size to 1kb when SSL is enabled #4601

@XinyuHou I had no choice but to block clipboard data over 1kb in
size... anything over that and you get an access violation.

src/lib/server/Server.h

@@ -175,6 +175,9 @@ public:
 	//! Return received file data
 	String&				getReceivedFileData() { return m_receivedFileData; }
 
+	//! Return true if using secure network connection
+	bool				isSecure() const;
+
 	//@}
 
 private: