[request] dynamic endian control

[Tcll]

<switch test="identity.data" comment="">
    <case range="1"><eval expr="endian=&quot;little&quot;" display_error="false" display_result="false" comment=""></case>
    <case range="2"><eval expr="endian=&quot;big&quot;" display_error="false" display_result="false" comment=""></case>
</switch>

<data type="int" name="flags" format="unsigned" len="4" display="" byte_order="{endian}"/>

currently I need to define each struct twice if I want dynamic endian control, which is a lot of work to have to manage when templates become complex.