Qt5 allows runtime detection of touch devices. This commit reworks
the current touch map tool by pulling its behavior into the normal
pan tool when a touch device is detected.
It avoids the need for a seperate map tool for touch interaction,
and also avoids having this tool always appear on the Windows
builds (regardless of the presence of a touch device)
This functionality is available in OGR and there is no longer
a need for a dedicated QGIS plugin to do this task
Marked as feature for documentation + changelog reminder
