Make module package depend on its own tool package

Also make the tool package depend on all tool packages that correspond
to the qt module dependencies.

So find_package(Qt5Widgets) implicitly calls find_package(Qt5WidgetTools).

And find_package(Qt5WidgetsTools) will call find_package for
Qt5GuiTools, and Qt5CoreTools.

This enhances the user experience, so that in modules like qtsvg, you
don't have to specify both find_package(Qt5Widgets) and
find_package(Qt5WidgetsTools), but only the former.

Or when cross building, you only need to specify Qt5WidgetTools, to get
both Core and Gui tools.

Change-Id: Ib1c5173a5b97584a52e144c22e38e90a712f727a
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

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