Remove MoveCrosshairRelative function and convert old usage to FitCrosshairIntoGrid()

The two places this function was used passed (0, 0) as the position delta, and intend
only to force a re-calculation of the grid-snap.

Make the intent more clear by calling FitCrosshairIntoGrid() directly.
crosshair.c: Clean up MoveCrosshairAbsolute() to make the logic more readable
puller.c: Fix trace printf in find_pair() to reflect actual arguments
puller.c: Fix some cases where we use int rather than Coord
Fix the AppData and update to the latest spec version

Also, include the full size screenshot as the old one was too small to be used.

Signed-off-by: bert <bert.timmerman@xs4all.nl>
Added translatable tooltips for toolbar buttons.

Signed-off-by: bert <bert.timmerman@xs4all.nl>