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Converts .NET objects wrapped in a container to a corresponding Lisp
object if possible, otherwise <code><i>container</i></code> is returned ummodified. Currently the following conversions are implemented:
<p>
<table border=1 cellspacing=1 cellpadding=3>
<tr><th>.NET type      </th><th>     Lisp type</th></tr>
<tr><td><code>System.Int32</code>   </td><td>       <code>integer</code></td></tr>
<tr><td><code>System.Int64</code>  </td><td>        <code>integer</code></td></tr>
<tr><td><code>System.Char</cod