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)
* move src/mapserver to src/server (IMHO better name and in sync with
python/server)
* rename cmake option WITH_MAPSERVER to WITH_SERVER
* rename define MAPSERVER_HAVE_PYTHON_PLUGINS to HAVE_SERVER_PYTHON_PLUGINS
