Set up stacked widget.

src/core/file_utilities/File.cpp

@@ -1,5 +1,6 @@
 #include "File.h"
 #include "FileLogger.h"
+#include <streambuf>
 
 File::File(std::filesystem::path path)
     : mFullPath(path),
@@ -62,6 +63,18 @@ FileFormat::Format File::InferFormat() const
     return FileFormat::InferFormat(extension);
 }
 
+void File::WriteText(const std::string& text)
+{
+    (*mOutHandle) << text;
+}
+
+std::string File::ReadText()
+{
+    std::string str((std::istreambuf_iterator<char>(*mInHandle)),
+                     std::istreambuf_iterator<char>());
+    return str;
+}
+
 bool File::PathExists() const
 {
     return std::filesystem::exists(mFullPath);