IDManager : finished Import/Export. Added merging capability to import (asks if particular ID is replaced during import). Added ESC as closing shortcut to IDManager dialog, and adjusted its size.

<?xml version='1.0' encoding='utf-8'?>
<BeremizRoot xmlns:xsd="http://www.w3.org/2001/XMLSchema" URI_location="LOCAL://">
  <TargetType/>
</BeremizRoot>