Remove cell_pathfinding compatibility layer as indicated by comment

Partically reverts 6bf7d2d902af27f632e1835cdcde287469141129 on this file.
Possible fix. refs #777
Fixed the dates in all headers to read 2005-2013
Fixed improper spacing in file headers
 * Fixed the visible/invisible problem. fixes #780
 * Fixed hopefully the segmentation fault which is described here https://github.com/unknown-horizons/unknown-horizons/issues/1993
Merge pull request #775 from fifengine/rm-pathfinding-compat

Remove cell_pathfinding compatibility layer as indicated by comment
Fix password- and textfield not accepting initial data
Fix a few typos
 * Fixed another bug that was related to the segmentation fault which is described here https://github.com/unknown-horizons/unknown-horizons/issues/1993
Merge branch 'master' of https://github.com/fifengine/fifengine
Adding .gitattributes file to help deal with eol characters
Normalize line endings
More line ending changes