Liquidpy

- ✨ Implement a playground powered by pyscript
- ✨ Add filter `call` for `wild` mode

- ✅ Add tests regarding 47
- 📌 Upgrade and pin dependencies

- 🩹 Make `default` filter work with `None`
- 🩹 Make `attr` filter work with dicts
- 🩹 Use filter `liquid_map`, in wild mode, instead of `map`, which is overridden by python's builtin `map`

- 🐛 Fix `date` filter issues (38, 40)
- ✨ Add `markdownify` for jekyll (36, 37)
- ✨ Add `number_of_words` for jekyll
- ✨ Add jekyll filter `sort`
- ✨ Add jekyll filter `slugify`
- ✨ Add jekyll filter `array_to_sentence_string`
- ✨ Add jekyll filter `jsonify`
- ✨ Add jekyll filters `xml_escape`, `cgi_escape` and `uri_escape`
- ✨ Add `int`, `float`, `str` and `bool` as both filters and globals for all modes (40)

- ✨ Add `regex_replace` filter
- ✨ Allow absolute path and pathlib.Path passed as template files
- ✨ Allow `+/-` to work with date filter (38)
- ✨ Add `filters_as_globals` for wild mode (defaults to `True`)

- Reimplement using jinja2