When starting to edit a new dive location, create
a marker at the current map center instead of zooming
out and centering on the 0,0 coordinate.
This will help (and speed up) a lot the edition,
if the user needs to add numerous dive markers
at a specific location close to each other.
refs #754
Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Move all the map widget platform agnostic files to the
<subsurface-root>/map-widget folder.
This avoids the confusion about the desktop version of subsurface
using mobile components. The map widget is planned as a shared
component between the mobile and desktop versions.
desktop-widgets/mapwidget[.h/.cpp] still remain as those are specific
to the desktop version.
Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>