## Changes
* fixed an issue with the **py-editor** related to the new `linebuffer` directive
* provide in worker hook scope a simple callback that pre-buffers unicode sequences [accordingly to the standard](https://encoding.spec.whatwg.org/#utf-8-bytes-needed) so that the buffer is sent to the terminal only once those sequences are fulfilled
* test with both `µ` and way more convoluted sequences such as 👩❤️👨 that the output, if either requested as input or already evaluated from the page works ... in latter case `test = "👩❤️👨"` completely messes up the program and the resulting string is empty
* added a *py-editor* plugin based on *codemirror*
* use a `<script type="py-editor">` wrapper to bootstrap code
* tested that all is good via smoke-test in test/py-editor.html
