slidecopy: initial implementation for custom tool panels
slidecopy: initial implementation for custom tool panels

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 :)
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