template-content vars via essence accessor: $item['%name'] and global running template registry
1. correctly parse content-template vars {$item.%description}
2. alternative call ... with syntax with "=" separator:
{call tpl with $x = '123', $y = $trolo+1}
together with old inverted with "as" separator:
{call tpl with '123' as $x, $trololo+1 as $y}