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

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автор: SilverIce

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

[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

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