Refactored jwidget_set_text to Widget::setText (same for setFont, setEnabled, etc.).
Created "Frame" class.
Refactored "jwindow_funcname" functions to "Frame::funcname".
Renamed JWidgetPtr to FramePtr.
(the new compiler used for the following Win32 binary releases).
+ Modified some error handling code to use C++ exceptions.
+ Modified some collections (std::vector, std::map, etc.) from instances to pointers.