Sometimes when using 'Go To Position', 'Go To Town Position' or 'Go To
Teleport Destination', we want to return to the previous position.
- Renamed 'CenterOnPosition' to 'SetScreenCenterPosition'.
- Added 'GetScreenCenterPosition' and 'GoToPreviousCenterPosition'
methods.
- Remove trailing spaces.
Clean git repository since the old svn / git mess was pretty much
unrecoverable unfortunetly. I would have liked to keep the history
for posterity, but that proved to be a futile quest.
