Open Modular Turrets

<p><strong>Additions</strong></p>
<ul>
    <li>added a priority system for turrets and reworked targeting largely</li>
</ul>
<p><strong>Changes</strong></p>
<ul>
    <li>needs OMLib 3.2.0-250</li>
    <li>cleaned up Valkyrien Skies integration</li>
</ul>
<p><strong>Fixes</strong></p>
<ul>
    <li>energy usage was not settable to zero</li>
    <li>Crash when ray tracing turrets hit multipart entities (such as the ender dragon)</li>
    <li>small bug where turrets would attack unknown living entities</li>
    <li>Computer Craft missing functions added and bugged ones fixed</li>
    <li>inventory expanders only having half of their intended stacksize limit</li>
</ul>