Released version 2.6.0

• added custom functions via $latte->addFunction()
• Added optional chaining $var?->prop?->elem[1]?->call()?->item
• Short ternary operator now requires braces around array (for future optional chaining) (BC break)
• PhpWriter: short ternary checks if value exists
• CachingIterator: fixed IteratorAggregate -> Iterator conversion
• BlockMacros: check when dynamic snippet is combined with id attribute [Closes nette/application#242]
• BlockMacros: added $snippetAttribute for custom HTML attribute with snippet id [Closes nette/application#242]
• removed latte.php