[Feature-Request]Store and rebuild tool windows

[ruespe]

When an item from expander is released as tool-window, this information will be stored at closing PlanG, but the tool-windows are not shown on startup (nor the items are shown in the expander). It would be perfect, when the released windows would be shown at the same place where they were at closing PlanG.

Additional: the tool-windows are always-on-top, even when this option isn't selected. This should be made optional.

Thanks
Rog