Add log of game events since last load and overall

Add console command
Add to crashlog

src/economy.cpp

@@ -599,6 +599,8 @@ void ChangeOwnershipOfCompanyItems(Owner old_owner, Owner new_owner)
 
 	cur_company.Restore();
 
+	RegisterGameEvents(new_owner != INVALID_OWNER ? GEF_COMPANY_MERGE : GEF_COMPANY_DELETE);
+
 	MarkWholeScreenDirty();
 }