Shlex tokenizer

```python
from shlex import split
split('echo -e "hello world"')
# ['echo', '-e', 'hello world']
```
Current:
```xsh
echo 'echo -e "hello world"' | tokenize-output -p
# echo
# hello
# world
```
Required:
```
echo 'echo -e "hello world"' | tokenize-output -p
# echo
# hello world
# hello
# world
```