Feature request: Add helper `|count` for counting things

[stepansvoboda]

Currently it is possible to use this:

{count($foo)}

It would be nice to have common helper for this:

{$foo|count}

Maybe all PHP functions could be used as a helper...

[dg]

Maybe better way is to move |length from Application https://github.com/nette/application/blob/d7f6e9421077085b890fe020497d0c6201d7c0f5/src/Bridges/ApplicationLatte/TemplateFactory.php#L84 to Latte.

[milo]

Solved by #103