[Lazarus] multi desktop - scack window - column sizes

[Martin Frb]

This may only work with no anchordock. It was never finished for anchordock.

The ide layout, also saves column width (e.g. debugger stack win) 
together with the window size. (After all a smaller window may need 
different column width)

If I create 2 layouts, and have different sized stack windows, then the 
column sizes are not restored between the 2 layouts.