fdo#52461 Multiple instances of same cell now get same color.

nColorData added to ScRangeFindData for color assigned to cell.
While inserting a range in maEntries, vector is checked.
If the range is already present, the color is returned.
Else, a new entry is pushed in the vector and it's color is returned.

Conflicts:
	sc/source/ui/inc/rfindlst.hxx

Change-Id: I38b93092cd22fa42ada55fa5d28eec9b71c12703