[10681] Added new Cell::Visit* functions to visit grids with center in (x,y) coords

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<pre>m src/game/Cell.h
m src/game/CellImpl.h
m src/game/Map.cpp
m src/game/Spell.cpp
m src/shared/revision_nr.h
</pre>
<pre style='white-space:pre-wrap;width:81ex'>[10681] Added new Cell::Visit* functions to visit grids with center in (x,y) coords

* This fixes possible problems with Spell::FillAreaTargets(center of search should be (x,y) position, not spell caster's position)
* Cleanup Cell class, removed old and unused code</pre>




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