Revert "Move connected_items from hash table to tree"

This reverts commit 187aa1c171.

eeschema/sch_item.h

@@ -26,7 +26,6 @@
 #define SCH_ITEM_H
 
 #include <unordered_map>
-#include <map>
 #include <set>
 
 #include <eda_item.h>
@@ -492,7 +491,7 @@ protected:
                                           // to store a initial pos of the item or mouse cursor
 
     /// Store pointers to other items that are connected to this one, per sheet.
-    std::map<SCH_SHEET_PATH, SCH_ITEM_SET, SHEET_PATH_CMP> m_connected_items;
+    std::unordered_map<SCH_SHEET_PATH, SCH_ITEM_SET> m_connected_items;
 
     /// Store connectivity information, per sheet.
     std::unordered_map<SCH_SHEET_PATH, SCH_CONNECTION*> m_connection_map;

eeschema/sch_sheet_path.h

@@ -393,14 +393,6 @@ namespace std
     };
 }
 
-struct SHEET_PATH_CMP
-{
-    bool operator()( const SCH_SHEET_PATH& lhs, const SCH_SHEET_PATH& rhs ) const
-    {
-        return lhs.GetCurrentHash() < rhs.GetCurrentHash();
-    }
-};
-
 
 typedef std::vector< SCH_SHEET_PATH >            SCH_SHEET_PATHS;
 typedef SCH_SHEET_PATHS::iterator                SCH_SHEET_PATHS_ITER;