Multiline Filters

I assume there already is a related issue,
but I wasn't able to find it if it exists.

Suggestion

Allow multiline filters in liquid blocks

{% liquid

    # Showcase of multiline goodness

    assign value = 'this-is-a-test'
        | split : '-'
        | uniq
        | sort_natural
        | join : ' '

%}

Reasoning

This would allow people to write cleaner, more structured
code that doesn't rely on the overuse of {% tag %} blocks
and would make writing 'pure code' a much easier task.

Extended

The same would be for parameters as well

{% liquid

    render 'snippet'
        , a : a
        , b : b

%}

Start from the multiline {% liquid %} examples in the issue and trace how Liquid blocks, filters, and render parameters are parsed. Define the accepted multiline syntax and verify that the filter-chain and parameter examples parse and preserve their intended behavior, while checking existing syntax tests if you locate them.