[TD] Add TaskPanel for Balloons

TaskPanel can be open by double clicking either Balloon label on drawing
page or Balloon object in tree view.

src/Mod/TechDraw/Gui/Resources/icons/circular.svg

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src/Mod/TechDraw/Gui/Resources/icons/hexagon.svg

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src/Mod/TechDraw/Gui/Resources/icons/inspection.svg

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src/Mod/TechDraw/Gui/Resources/icons/none.svg

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src/Mod/TechDraw/Gui/Resources/icons/rectangle.svg

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src/Mod/TechDraw/Gui/Resources/icons/square.svg

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src/Mod/TechDraw/Gui/Resources/icons/triangle.svg

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