Add a button that opens the 'Contribute' page to the 'About' dialogue,
to encourage more users to start to contribute.
Requires https://github.com/subsurface/new-website/pull/36 to be
deployed to have a valid link target.
Signed-off-by: Michael Keller <mikeller@042.ch>
Since we have now destkop and mobile versions, 'qt-ui' was a very
poor name choice for a folder that contains only destkop-enabled
widgets.
Also, move the graphicsview-common.h/cpp to subsurface-core because
it doesn't depend on qgraphicsview, it merely implements all the
colors that we use throughout Subsurface, and we will use colors on both
desktop and mobile versions
Same thing applies for metrics.h/cpp
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
