- Check the denominator for zero for both zoomed width and height.
- Do not allow to move zoom slider above possible position.
- Move commonly used `zoomTo` function into new header file.
CORE-14539
- Wrap implementation of Mirror/Rotate, Stretch/Skew and Attributes dialog in subclasses of CDialogImpl
- Turn global variables from code that was moved into member functions into member variables
- Add global instances of all three dialog classes
- Use <global instance>.DoModal(...) instead of one-line wrappers
- Replace some TCHAR arrays with CStrings