* Replace Eeschema find code with a collector based implementation.
* Fixed a search bug when all subsequent searches of an item would ignore
  the remaining valid child items when an item had more than one child
  item that matched the search criteria.
* Add SCH_FIND_COLLECTOR class to find all items that meet the specified
  search criteria.
* Add SCH_FIND_COLLECT0R_DATA to keep track of information for all matching
  items.
* Use collector to iterate over the list of items that match the search
  criteria rather than trying to start at the last matched item.
* Remove unused searching methods from sheet path and sheet path list
  objects.
* Add replace and replace all functionality to Eeschema find dialog.
* Push matching methods down to EDA_ITEM class so they can be used by
  other derived objects.
* Add method to EDA_ITEM to test if item supports replacing.
* Add flag to find/replace data to support replace feature.
* Disable wild card matching check box when dialog is in replace mode as
  wild card replacement is not supported at this time.
* The usual Doxygen comment and coding policy fixes.