Guides/Window Driver/Changes from J6

The window driver in J8 is similar, but not identical to the window driver in J6 and earlier. When migrating from these earlier versions, some manual conversion of wd definitions is needed. The event handling is essentially the same, however form definition is changed to match layouts. The biggest change is that the old child position and size command (xywh) has been removed. Instead, layouts are done automatically, with layout containers (bins), and invisible stretchers that push controls around when the form is resized. Once you are familiar with the form definition, it should be straightforward to manually edit the old form definitions.

Changes include: a new command "wd 'bin xxx'" specifies the layout bins. A new control "table" defines the QTableWidget grid control. A new command syntax "wd 'set id property xxx'" specifies control properties.