The idea is to allow third-party components to plug additional tool panels into the task pane,
by using the drawing framework (http://wiki.services.openoffice.org/wiki/Drawing_framework).
This first step is not finished at all, it just adds a configuration scheme/data for such
custom tool panels, and implements basic functionality in the ToolPanelDeck to respect this
config data. Additionally, the first version of an example extension for a custom tool panel
is implemented in sd/workben/custompanel.
Still, except showing a drawer in the tool panel deck, representing the custom panel, nothing
works. More to come :)
Instead of simply letting svtool's ToolPanelDeck decide on panel activation, requests are re-routed through
the view's ConfigurationController. So, clicking onto a tab just requests the activation of the respective
resource, which in turn - when the requested configuration becomes the active configuration - will activate
the ToolPanel.
